All the games on here are great, but I have a problem with Super Mario Bros 1. The NES game makes very good use of key frames, but the extra (or different?) frames in 1 make it very hard to tell when Mario hits his run, and it's easy to under- or overshoot jumps because of it.
All of these games are better on the NES, but this collection is still fun!
All of these games are better on the NES, but this collection is still fun!