There's just something about water and sea life that seems to work really well when it comes to slot machine themes. Analogue slot machines in land-based casinos have long used aqua-inspired themes and motifs in their setups. 05, 2023 9 minute read Goldfish Slot Game Theme and OverviewĪs you've probably already guessed, the free WMS Goldfish slot is based on that old casino favourite - the 'goldfish' or 'aquatic' theme.