Rainbow Reels is a 5×4 slot with 40 Pay Lines, at an RTP of 96.07%, and a maximum win of 5000x stake.

This reveals the first of seven layers of various icons meaning each win can potentially lead to more wins, as new symbols are uncovered 

At least three Scatters are needed to enter the thrilling bonus round
Revealing the seventh and final layer in the bonus will grant a wild which can form part of a winning combination up to 13 times before being removed from play