Mermaids

Mermaids by NetEnt is a five-reel slot with 20 fixed paylines, high volatility and an RTP of 96.09%. The game uses a Progress Globe system built around three coloured Progress Wilds, while a fourth Wild appears only in the Random Wilds feature. Wild symbols can substitute for paying symbols to form winning combinations on a line.

The demo version lets players play for free and practice before playing for real money. As progress builds, the White, Green and Purple Globes unlock different features: Mermaid Spins, Wild Spins and a Picker Bonus. Mermaid Spins award 10 free spins with active Random Wilds and no royal symbols, while Wild Spins trigger 10 spins with Random Wilds and no Green Progress Wilds.

The Picker Bonus starts after 15 Purple Progress Globes and gives three picks from hidden prizes. Possible rewards include multipliers from x2 to x50, along with Mermaid Spins or Wild Spins. The bet range is 0.1 to 40, placing the slot in the medium-to-high stake range for a standard online casino slot review.