Cheat :
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 name.
Hint :
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.
Hint: Completing the Tokyo Must Go level:
Select the walker, destroy all humans with the upgrade at the redlines, and destroy all the buildings.