About Rainbow Flip & Slide, from BoardGameGeek:
Flip tiles to reveal hidden colors, slide them into place, and build your rainbow before anyone else can.
How to win: Be the first player to build a rainbow from red to violet, connected to your player tile.
Gameplay:
Every turn, each player gets to perform 2 actions 1) reveal a color by flipping over a tile and 2) sliding a tile to a new position to build a rainbow.
-description from the designer