Alien Front Online

Level select:
Enter %l2I?l as a password. Note: l is a lower-case "L" and I is a upper-case "i".

Fog mode:
Start a new game and enter FOGFOGFOG as a room name.
Information in this section was contributed by curtis38.

Poison Flag mode:
Start a new game and enter POISON FLAG as a room name. Your energy will decrease as you hold the flag.
Information in this section was contributed by curtis38.

Hint: Completing Burn, Baby, Burn level (as humans):
Get the medium tank, then destroy one alien. Go to the green lines and recharge. Repeat until all the aliens are gone. Then burn everything. Do not look at the map, just destroy everything to complete the level. You should only have one dot remaining when the level is completed.
Information in this section was contributed by Alan A.

Hint: Completing the Tokyo Must Go level:
Select the walker, destroy all humans with the upgrade at the redlines, and destroy all the buildings.
Information in this section was contributed by Alan A.