Rich Castle is a 5-reel, 3-row video slot with 20 paylines.
The objective is to land as many identical symbols as possible along a payline. Winning combinations start on the first reel on the left and run along an active payline to the last reel on the right.
Only the highest winning combination of one symbol is paid out.
After activating a payline (which can include three BONUS symbols), all winning symbols disappear and new symbols enter gameplay.
New symbols form new winning combinations, that are multiplied by an increasing MULTIPLIER.
The win MULTIPLIER increases with every new Cascade during both regular gameplay and Free Spins rounds.
The Cascade MULTIPLIER increases in incremental steps as follows: x1, x2, x3, and x5.