I beat many games with a broken NES. I can't specifically say what was wrong with it, but it would cause a variety of glitches depending on the game. It would cause something like Solomon's Key to freeze randomly (and I could tell when a game would freeze, because the music was different...missing some of the midi instruments). But the worst was Ninja Turtles 2 (The Arcade Game). It could cause random glitches including projectiles to get stuck mid-air in some kind of spasming animation. You'd have to run into the projectile to make it disappear because the game wouldn't let you advance while the projectile was there having some kind of fit. That was all well and good, but there was one level where the foot soldiers were throwing spears. The spears wouldn't disappear when you ran into them. So you literally were stuck and had to hit the reset button. Those were bad.







