What games do the Konami code work on?

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Tags

1. #games
2. #players
3. #konami
4. #right
5. #gradius
6. #there
7. #first
8. #variations
9. #nintendo
10. #featured
11. #several
12. #common
13. #released
14. #entertainment
15. #system
16. #start
17. #power
18. #cheat