SEGA:

Nintendo :

Up/down/left/right: Use ARROW KEYS.
Start-key: Press B.
A-key: Press X.
B-key: Press C.
C-key: Press V.
You can edit the Control keys by pressing right click on the game screen.

Up/down/left/right: Use ARROW KEYS.
Start-key: Press ENTER.
Select-key: Press CONTROL.
B-key: Press Z.
A-key: Press X.

MSX:

ATARI:

Up/down/left/right: Use ARROW KEYS.
Space: Fire
 

Up/down/left/right: Use ARROW KEYS.
Space: Fire
Use the mouse to select the level By Pressing "Select" from under The Game Screen.
Use Reset to Start the game
 

SNES