How hard can slide puzzles with unit pieces making rook-type moves on small boards be? It's a good thing that the first few are fairly easy. . .

Can you move a red piece into each bottom corner marked with a red circle?
Here are 40 original challenges to help you find out! Any piece wil do if none are red.
Use your puzzle-solving skills to move each piece to (and from) a position next to another.
Note that only the moved piece and any in the group that it touches can make the next move.