From Markus Persson:
From the creator of Minecraft. Drop is a fast paced typing game that will test your keyboarding skill and patience. Try and reach that high score and win the approval of a video game.
Press d to start playing.
Type blinking letter to advance.
Press space or enter to submit letters.
Bonus points if more than four letters.
Game gets faster.
Game over if letter leaves screen.
Typing wrong letter speeds up.