These little tricks are meant to find ways to break a cub3D. Note that if it's handled in any way, it's good. Something being handled doesn't necessarily mean that the game needs to start. If an error is returned, that's perfectly fine too, as long as it doesn't segfault, leak...
- putting a negative resolution
- adding a third resolution number
- leaving only one resolution number
- replacing the space between the two resolution numbers with a tab