Arrow mode is a google snake mode that forces the snake head to make the same turn it did in the past in the same tile the next time it steps on that tile. The only exception to this rule is when an apple spawns on top of the tile, freeing it from the "arrow" forcing effect. When you ride an arrow, you "eat" it and it disappears. In Blender mode mixed with sokoban, the box moves the way the arrow points instead. If you go the opposite direction of an arrow, you crash into it.