Super Mario Bros. X features some modes that make the games easier/harder. They can be acessed via cheating or options in level testing.
Probably the best of all. It makes you immune to any hurt, even lava(PS: It don't work if you fall propusely into a hole.
Grab All ModeEdit
You can grab any NPC you find.
Show FPS ModeEdit
Shows the frame rate on the upper-left corner of the window.
Max FPS ModeEdit
Probably the worst. Makes the game force the FPS to max speed.
Walk Through Walls Mode Edit
Creates a colorful circle around you and allows you to walk through walls.