The Super Studio games (Mickey & Friends, Princess, Incredibles 2 and Frozen 2) all use WET erase markers. Using any other kind of marker will ruin the SketchPad. Need or want more of these markers? Osmo sells an expansion pack of Super Studio markers on our website here.
The Monster game and Creative Set use DRY erase markers. Need more markers? Any dry-erase marker will work just fine.