Now here's an example of a really big resource rip-theft ripfest game:http://youtube.com/watch?v=T4AU1qZUdRM.
Let's try to find out what this game stole out of:
-The majority of it (player, alien and enemy runners, prone sniper, grenadier, weird vomitting christmas tree, slugs, life medals, gun bullets, sounds, more) come from Super Contra.
-The first level is a rip from Mighty Final Fight, but a bit modified to be long.
-The second level boss is apparently from Shadow of the Beast?
-The final level's boss is a clear-cut variant of NES Contra's Waterfall boss. This is a different color, has no arms, giant fire rings out of the mouth and slugs out of the ears. In other words, less dynamic.