Behind the Wall
A dot slides behind a wall; tap the moment it would come out the other side.
How to play ↓A dot rolls toward a wall and disappears behind it. Tap, click or press Space at the moment you think it comes out the other side. Your score depends on how close your tap is to the real moment.
Assist mode: the dot moves 25% slower, scoring is more forgiving, and a ring fills while the dot is hidden. Ring on: easier.
How to play
Five rounds. In each one a dot moves to the right at a steady speed and goes behind a wall, where you cannot see it. Tap at the moment you think it reaches the wall's right edge. You then see where it came out, where you tapped, and how many milliseconds early or late you were. The score runs from 0 to 10 and the total is out of 50.
The time spent hidden grows from about 0.8 seconds in the first round to about 2.5 seconds in the last. It is worked out from the wall's width and the dot's speed. A tap within a few percent of the real time scores 10, and a tap 35 percent of the hidden time off or more scores 0. A tap before the dot is behind the wall is ignored, and a round with no tap scores 0.
Scores include your device's own input delay, usually tens of milliseconds. The game does not subtract it.
Controls
| Keys | Action |
|---|---|
| SpaceEnter | Tap |
Ways to play
- Tap: press Space or Enter, or click or touch anywhere on the stage. The whole stage is the target, and the tap is timed when you press down, not when you let go.
- Assist mode: the dot moves 25% slower, scoring is more forgiving (35 percent becomes 60 percent of the hidden time) and a ring fills while the dot is hidden. Ring on: easier.
- If you switch tabs during a round it restarts without losing a score. Nothing else is timed and a round lasts about four seconds at most.
- The dot keeps moving under reduced motion, because the movement is the information.
Who this works for
Sighted players who can press a key or tap within roughly a tenth of a second. This is a visual timing game: you have to watch the dot move to judge its speed, so it is not playable with a screen reader and there is no audio version yet. The result of each round is also written out as text. This has not yet been checked with a screen reader or on a 120 Hz display.