The catalogue groups games by features supported by their actual rules. Here is what those names mean.
Free Spins.
A qualifying trigger opens a sequence of extra spins. Each game explains its trigger, count and any special multipliers. A free-spin feature awards only free virtual chips.
Hold & Spin.
A separate feature locks qualifying symbols in place and gives a limited number of re-spins. New qualifying symbols may reset that counter. Rules inside the specific game describe how its final pot is calculated.
Expanding Wilds.
A Wild can grow to cover more positions or a reel. Character adventures may evolve the appearance or effect of a Wild as a feature progresses. Use that game’s rules for its limits and exceptions.
Cascades.
Symbols can be replaced or transformed across successive reveals. The game explains which positions qualify and how each reveal is evaluated. A cascade label does not mean every slot uses the same maths.