suggestion:
1) native south America (Mayas, Aztec, Inc, etc.)
2) civil war (of America or any other country)
3) American revolution
4) The war we are currently fighting (i wouldn't say the names because it might offend people)
5) any war that dealt with communism (Korean war, Vietnam war, etc.)
6) Ancient Greek wars ( or China or Europe, you get my point)
like this if you want something like a cat and you have to do something (battle it? almost like a boss battle) to get the cheese (it'll be interesting 'cuz of time limit)
 "World Rebellion II"){kind=icon}
 "Transformice"){kind=icon}