Here are some cheats and tips for the game Per.Oxyd.
Reveal level passwords:
Click on the coffee cup at the main menu to view the level passwords
for one-player and two-player modes.
Level Single player Two player
1 11111111 11111111
2 24121965 09111989
3 06223874 27182818
4 27182818 08150815
5 91929394 24559932
6 11011299 01020304
7 01928374 87654321
8 01168742 99999999
9 10011990 12345678
10 17041963 47382910
11 56388700 52014727