1 to 50

Tap 1 to 50 in order as fast as you can. Hard runs to 100 and reshuffles the board every 10 taps.

1 to 50

A five by five board holds the numbers 1 to 25 in random order, and you tap them in sequence starting from 1. Each cell you clear is refilled with that number plus 25, so tapping 1 puts 26 in its place and tapping 2 puts 27 there. When there is nothing left to refill, the cell stays empty. Normal ends at 50, hard ends at 100, and your time is the score.

After you press start the numbers stay hidden for a ready signal of just under a second, and the clock starts the moment they appear. The top bar shows the next number, the elapsed time, your misses and a progress bar.

Normal runs the same route twice

In normal the numbers 26 to 50 land exactly where 1 to 25 were. 26 is in the old spot of 1, 27 in the old spot of 2, and so on. From 26 onward you are retracing the path you just took, so even a rough memory of where your hand went in the first half makes the second half much faster. The board also thins out as you go, since every cell empties after its second number.

Hard shuffles every ten

Hard goes to 100. Every cell is refilled three times, so the board stays completely full until 75 and only starts emptying from 76. On top of that, every tenth correct tap reshuffles the whole board, empty cells included. That happens nine times in a run, after 10, 20 and so on up to 90, and the clock keeps running while it does.

A number appears 25 taps before you need it, and the board shuffles at least twice in that time. So there is no point memorising what pops up under your finger. What does help: between two shuffles nothing moves except the cells you tap. Right after a shuffle, sweep the board once and lock in the next two or three positions; they will stay put until the next shuffle.

Misses and records

Tapping the wrong number flashes that cell red, shakes it and adds a miss. There is no time penalty, but the clock does not stop while you search. Empty cells do nothing. A tap registers on press rather than on release, so light quick taps are faster.

The last number stops the clock, and the result screen shows your time to the hundredth of a second along with your miss count. A run with no misses earns a flawless badge. Rankings sort by shortest time and are kept separately for normal and hard. Restarting mid-run throws that attempt away and starts over without a record.

You play with the left mouse button or touch, in portrait or landscape. The language menu at the top switches between English, Korean, Japanese and Chinese, and if you turn the sound off that choice is remembered on this device. The tap sound climbs in pitch as you get further through the run.