A four by four grid of sixteen tiles lights up one tile at a time, each with its own colour and emoji, and you click the same tiles back in the same order. Every level you clear adds one more step to the sequence, so the pattern grows until you make a mistake.
Clearing a level awards the level number times 10, so level 1 pays 10, level 2 pays 20 and level 5 pays 50, and the level counter then rises by one. Score is compared against Best after every cleared level. A wrong tile ends the run at once: score returns to 0 and the level to 1, and a new one step pattern starts. Because the reward grows with the level, the end of a long run is worth more than its whole opening.
No. Input is locked until the last flash finishes and the message line asks you to repeat it.
Yes. A single wrong tile resets the score to zero and the level to one, though Best stays on screen.
Yes. On a touch screen the game shows on-screen buttons, and games played with a mouse work by tapping.