Keyboard rollover test: check the combinations your game needs

Reference graphic from this guide. The complete instructions and tool, where available, remain in the article.

If movement stops when you hold another action key, test that exact combination before buying a new keyboard. A device can recognize every key on its own and still fail to report a particular group pressed together. The useful question is whether your game's required combinations work on your setup.

Microsoft's anti-ghosting explanation notes that an anti-ghosting claim can refer to a subset of keys. That makes the actual layout worth checking. A label on the box is less specific than a test of the keys you need.

Check a physical keyboard

Simultaneous key check

On a physical keyboard, focus the box, then hold your intended game keys together. Tab leaves the box. Browser and operating-system shortcuts may intercept some combinations. No keys are stored or sent.

Focus here to test game keys.

No keys held.

Without JavaScript, test the same combination in the game’s control screen or the manufacturer’s diagnostic tool. On a touch-only device, this test cannot establish physical-keyboard rollover.

The widget reports keyboard events delivered to this page. It cannot see a key that the browser or operating system intercepts, and it cannot prove what a particular game receives. Use a failed result as a reason to investigate, then repeat the action inside the game.

Start with the real combination

List movement and action inputs that occur together. For a hypothetical platform game, that might be moving right while jumping and holding an action. Use your actual bindings; there is no universal set of keys that represents every arcade game.

Press each key alone, then pairs, then the complete combination. Keep the order consistent for the first test, then try another order. Record which keys appear and which disappear. Avoid system shortcuts, password fields or sensitive text while testing.

Separate hardware from mappings

If the browser receives the full combination but the game does not respond, inspect the game's bindings and input rules. Two actions may share a key, or the game may intentionally ignore an action in that state. Check its instructions before treating the result as hardware failure.

If a combination fails in several appropriate tests, try a different supported binding. Change one key, repeat the same sequence and record the result. A small remap may solve the practical problem without requiring a different device.

Check shared-keyboard play

When two people use one keyboard, test both players' common combinations together. Each person's controls may work separately while the combined set fails. Use a safe test area in the game so the players can coordinate the input without losing progress.

Choose a layout that everyone can reach comfortably and that the game allows. Do not assume that attaching another keyboard creates separate input identities; many games treat keyboard input as one shared source. Consult the game's local multiplayer instructions.

Understand the browser result

The widget displays physical key codes where available, which can differ from the character printed by a particular keyboard layout. The MDN keyboard documentation explains how key values depend on modifiers and layout. What you see here is a diagnostic label, not a test of typing accuracy.

Focus must remain inside the test box. Leaving it clears the displayed held keys, and Tab remains available to move away. If a key appears stuck after a missed release event, leave and refocus the box before starting another test.

Save the working bindings in your own notes and apply them through the game's normal settings. After a remap, test menus and gameplay separately so that an improvement in one action does not make another required action inaccessible.

For an older platform-game entry, see SuperCow archive entry.

Local co-op on PC: check the controls before game night

Reference graphic from this guide. The complete instructions and tool, where available, remain in the article.

Before inviting people over for a PC game, check that it supports the number of local players you plan to host. An online multiplayer label does not establish couch co-op. Open the exact store page and look for the local or shared-screen mode you intend to use.

Then count input devices. Two connected keyboards do not automatically become two independent players inside a game. The game must support the arrangement, and its joining screen or control documentation should explain how each player enters.

Run this setup check early

Scroll the table sideways on a narrow screen to see every column.

Local multiplayer readiness

Check	Test	Pass condition
Local player limit	Read exact mode description	Enough places for the group
Input assignment	Join with every intended device	One intended player per device
Readability	View from every seat	Instructions and text are readable
Pause and rejoin	Try during a safe test	Everyone knows the behavior
Progress	Save and reopen normally	Correct shared state resumes

Write down the working arrangement after the test. If the game needs a keyboard for one player and a controller for another, make that explicit. A simple note prevents a last-minute reshuffle when someone arrives with a different device.

Test joining from a fresh launch

Close the game normally, connect the intended devices and launch it again. Have each person join through the game's own instructions. Check that each device controls the correct character, including in menus and during a normal level.

If two devices control the same character, stop and inspect assignments before changing unrelated settings. A controller may be mapped to keyboard input, or the game may require an explicit join action. Use its documentation to distinguish those possibilities rather than assuming the hardware is broken.

Check the screen from every seat

Small text and shared-camera movement can become problems away from the desk. Test the menu, instructions and a busy moment from the farthest seat. If the game offers text size or display-area controls, adjust them before the session begins.

Agree on what happens when one player needs a break. Test whether the game pauses for everyone, keeps running or allows someone to leave and rejoin. Do not learn the answer for the first time during a difficult section.

Keep remote participation separate

If one friend joins over the internet, check whether the game supports native online play or an appropriate streaming feature. Steam Remote Play Together can share supported local multiplayer games from the host's running copy. It still depends on the game's supported mode and controls.

Test that arrangement before the main session. The remote player's connection and input path differ from those of someone sitting at the PC. A successful local test alone cannot establish the quality of the remote experience.

Prepare a fallback that fits the group

A second game with a confirmed working setup can save the evening if the first has an unexpected issue. Choose it before people arrive and launch it once. Downloading a replacement while everyone waits can consume the time intended for play.

For a shared keyboard, test the actual combinations players will press together. A menu that accepts each key individually does not prove it accepts them simultaneously. If a combination fails, try a supported remap or a different controller arrangement and retest the same action.

At the end, quit normally and confirm whose progress was saved. Keep the host account and any shared campaign choice clear so the next session starts from the intended state. Local co-op works best when the practical setup is already settled before the first level begins.

For the blog’s earlier casual-game coverage, visit New and Freshy games archive.

FPS to frame-time calculator: what the numbers mean for arcade games

Reference graphic from this guide. The complete instructions and tool, where available, remain in the article.

Divide 1,000 by frames per second to find the duration of an evenly spaced frame in milliseconds. At 60 FPS, that interval is about 16.67 ms. At 120 FPS, it is about 8.33 ms. This arithmetic helps explain the numbers shown by a performance counter.

It does not measure the delay between pressing a button and seeing a response. The response passes through other stages, and a frame-rate reading alone cannot tell you the total. Keep the calculator's result labelled as frame duration so it does not become an unsupported latency claim.

Convert a frame rate

Convert frame rate to frame duration

Frames per second

Example: 60 FPS corresponds to about 16.67 ms per frame.

Frame duration in milliseconds = 1,000 ÷ frames per second. This is an ideal even-frame interval, not measured input latency.

Calculations stay in this page. Nothing is sent or saved.

The calculation assumes frames arrive evenly. A game can report a reasonable average while delivering some frames much later than others. If you are investigating stutter, a frame-time graph contains information that an average FPS number leaves out.

Compare changes in milliseconds

Moving from 30 to 60 FPS changes the ideal interval from about 33.33 ms to 16.67 ms, a reduction of about 16.67 ms. Moving from 60 to 90 FPS changes it from about 16.67 ms to 11.11 ms, a reduction of about 5.56 ms. Both changes add thirty frames per second, but the time difference is not the same.

That does not mean one target is universally correct. A display, game engine and device impose their own limits. Use the numbers to understand a comparison, then choose settings based on the game and hardware you actually have.

Keep the display rate separate

A monitor's refresh rate describes how often it can refresh, while a game's frame rate describes how often it produces frames. Matching numbers on two menus does not prove smooth delivery or low input delay. Read the game's and display's documentation when choosing synchronization settings.

Avoid copying a universal "disable everything" preset. Tearing, pacing and responsiveness involve tradeoffs, and a setting that suits one system can behave differently on another. Record the original value and change one option at a time.

Use a repeatable scene

For a practical comparison, return to the same scene or challenge with the same settings and input device. Note the frame-rate range, visible stutters and the exact change you made. Do not compare a quiet menu with a busy level and attribute the difference to a graphics option.

If a game has a built-in benchmark, read what it measures. A benchmark result can help compare configurations, but it is still a sample of a particular workload. Do not present it as a guarantee that every level performs the same way.

Write a result that another person can understand

Record game version, device, resolution and the settings relevant to the change. A useful note says that a particular scene became steadier on your setup. It does not claim that all players should expect the same increase.

For an arcade practice session, prioritize a setup you can reproduce. Changing display mode or performance settings between record attempts can make the comparison harder to interpret. Keep experimental runs in a separate part of your score log, then return to the configuration you chose for ordinary play.

The calculator can convert any positive rate in its accepted range. Copy the output into your notes if needed; it is neither stored nor sent from this page.

The archive also includes the platform game SuperCow archive entry.

Arcade high-score tracker: compare runs without fooling yourself

Reference graphic from this guide. The complete instructions and tool, where available, remain in the article.

A new high score is easy to celebrate and surprisingly easy to misread. Before comparing it with an older run, check the mode, difficulty and scoring rules. A longer run with extra starting lives is useful progress, but it is a different comparison from a run under identical conditions.

Keep a small log with the date, rules and one observation. You do not need to record every button press. The note should explain what you want to repeat or change next time, such as a missed bonus route or a risky move that cost a life.

Calculate the change

Compare two scores

Earlier scoreNew score

Example: 10,000 to 12,500 is +2,500 points, or +25%.

Change = new score − earlier score. Percentage change = change ÷ earlier score × 100. Compare identical modes and rules.

Calculations stay in this page. Nothing is sent or saved.

The calculator compares two numbers. It does not know whether they came from the same game, a seeded challenge or different versions. If lower numbers are better, as in a completion-time challenge, label the result accordingly instead of calling every positive percentage an improvement.

Keep the comparison fair

Record the mode and difficulty beside every score. Add starting lives, continues used and any modifiers that affect scoring. If an update changes the rules, start a new group of results instead of mixing the old and new records without a note.

For games with random layouts or spawns, expect runs to differ for reasons beyond your decisions. You can still track scores, but avoid treating one exceptional result as proof that a new tactic always works. Repeat the approach under the same available conditions and compare a small set of runs.

Track consistency as well as the record

After several comparable attempts, sort the scores and look at the middle value. For an even number of attempts, average the two middle values. This median gives you a simple way to describe a typical recent run without letting one unusual result dominate the summary.

A hypothetical set of 8,000, 9,000, 9,500, 10,000 and 18,000 has a median of 9,500. The 18,000 record remains worth keeping, but it should not become the only number you use to describe normal performance. These figures are an arithmetic example, not measured results from a named game.

Add one useful observation

Write the first mistake that clearly changed the run. "Lost a life entering the narrow section" is actionable; "played badly" is not. If you cannot identify a cause, leave it uncertain and watch that section during the next attempt.

You can also record a success. A route that consistently keeps you alive may be worth retaining even if it produces fewer early points. The right choice depends on the scoring rules and whether your current goal is survival, completion or a record attempt.

Choose the next session’s task

Pick one observation to work on and keep the rest of the setup stable. If you change the control layout, route and difficulty together, your next score will not tell you which change mattered. Separate exploratory sessions from attempts you intend to compare closely.

Save the log somewhere you control. This page's calculator does not retain your numbers after you leave, so copy a result into your own notes if you want it later. A few dated entries with clear rules are more useful than a large collection of unexplained score screenshots.

For an older arcade title in the archive, see the Chicken Invaders 3 archive entry.

A short roster checklist before your next Clash of Clans war

When a clan has more volunteers than places in its next war, choosing who sits out can turn into an argument. A useful starting point is to check who used the attacks they were given, then ask about the exceptions.

We also run Clash Insight, an independent Clash of Clans fan site. These checks explain how to use its clan and war tools when preparing a roster.

Check who is in the clan now

Open the Clash Insight clan lookup with your clan tag and check the member list. Read the data timestamp, especially if people have recently joined or left. A saved roster may need updating.

Confirm war availability with the members themselves. Being on the roster does not tell you whether someone has agreed to play this week.

Look at missed attacks with the right denominator

WarPickr loads completed wars recorded by ClashKing, where available. You can choose a period and filter regular wars or CWL. It also accepts completed war JSON if you already have it.

Its missed-attack percentage is unused attacks divided by available attacks. A regular war normally gives a member two attacks; a CWL war gives one.

• A member has eight available attacks across four regular wars. If they use six, they missed two: 25%.
• A member has four available attacks across four CWL wars. If they use three, they missed one: also 25%.

Check the number of wars behind that percentage. Missing one attack in one recorded war is much less evidence than a pattern repeated over several wars.

Open player details before deciding

Read the war-by-war breakdown for anyone suggested to sit out. Check the battle dates and ask whether they had an agreed absence or were told to save an attack. The records show unused attacks, but cannot explain the player's circumstances.

WarPickr suggests a lineup from attack usage. Use its shield control to keep a player in when you have a reason, and set how many members need to sit out. The suggestion does not measure attack skill or predict who will earn the most stars.

Before you share the lineup

• Confirm the current members and their availability.
• Check which completed wars were counted. Missing records do not prove that a player skipped a war.
• Explain exceptions and share the numbers behind the decision. WarPickr can copy the lineup for Discord.

Clash Insight is unofficial and is not endorsed by Supercell. Historical coverage depends on the wars recorded by ClashKing; it may be incomplete for your clan.

 

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