The problem with some bugs its hard to find until its out there. For instance if you're attacking the bear while you're in the river with a blue axe( not the red one that's fine) at 12.01pm glitches the game. Them glitches wont be found unless the player does it. A funny glitch i can't remember which game( think its RD2) you eat a plant that makes you vomit while jumping off a cliff you bunny jump to the bottom. These kind of bugs can't be found inside the studio. Only players imagination willing to try these stunts will