I've now completed this game and I've got the cheat for every world so here goes:
level 2: wwwyxtc2nqw79vy
level 3: ?wz4vcln4w81v?
level 4: rssn3qj78?gjmc
level 5: wspzmso8n?h8nf
level 6: cv1?qwkgj3x8r5
level 7: hv21rw1gn3yor7
level 8: mv7hrclh3zsr9
level 9: rv8rrc2hx3?rjc
Classic mode: clss1281999dbm
That's all the levels I could find, so see ya!
If you need more help, we've got more Space Invaders cheats and also check out all of the answers for this game
Comments for this cheat