Hi! I have made a small review of the Dream Islands Promo Tiles! In summation, the Promo Tiles work as follows:
The promo comes with 12 tiles total; 3 tiles for each player, and they are one-time use tiles. The tiles allow you to:
(1) move as many playing pieces as you want forwards or backwards
(2) add or subtract 1 step to the number of steps you have selected with a shell
(3) reshuffle your draw pile
You are able to use as many tiles as you want at one time. Once they are used, they are removed from the game.
I hope this helps!