Download on itch.io: https://snot.itch.io/short-term-memory-exercise This is a free minimalist short-term memory exercise where you click on numbers in order. Once you click on one, the rest get covered. Very zen especially with headphones! Once you beat the game (16 levels), it goes into endless mode which eventually gets up to 25 numbers. It features music and sfx by Eric Matayas. Find his resources at http://soundimage.org/ Good luck!