Roller
The Roller increases movement speed by 12% while riding and for six seconds after riding, according to the gadget description.
How it works
The stated speed increase applies both while riding and for 6 seconds after riding. The source says to give Papy Pawn (Old Bot) 5 datalogs to obtain it, and places Papy Pawn at the Canyon safe area. The passage does not detail what counts as riding or describe other movement effects.
Read the supporting references
A factual reference to eleven named gadgets and their reported effects, activation conditions, and unlock clues from the retrieved Gadgets passage. It does not compare effectiveness or verify behavior beyond that passage. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.