Tetris, 1984 · Elektronika-60

The original controls use the numeric keypad (or the number row). At the start, press 0–9 to choose your starting level.

7
move left
9
move right
8
rotate (counter-clockwise)
4
speed up: level +1
5 / space
drop
1
show next piece on/off (+5 points per piece while off)
0
hide the help text