Nuts & Milk is a platform-style puzzle game developed and published by Hudson Soft in 1983. It is originally created for the MSX computer system as a simpler game, and later it's ported to Famicom. It was the first third party video game to be released on a Nintendo console and it was never released outside Japan.
Enter - start (pause);
Arrows - move;
X or Z - jump; Esc = exit fullscreen;
You can change keyboard settings, save (F5) and load (F8) the game.
Put your mouse over the game and choose your settings, you can also play the game in fullscreen.