Fishing Joy is the iOS port of a popular Asian arcade game, ostensibly about catching fish with nets but really about quickly calculating probabilities, taking risks, and earning coins.
Fishing Joy is a pretty game, with a top-down view of colorful fish swimming around a tropical undersea environment. You want to catch the fish by firing a net at them, and you only have two controls: you can tap on where you want the net to go, and you can tap on your net cannon to determine your net's size rating, from 1 to 7. You're very likely to catch small fish with a medium-size or large net, but sometimes even a medium-size fish will shrug off your largest net. You have to watch for the patterns of swimming sea creatures to determine how best to deploy your nets--and because catching fish earns you money while shooting nets costs you money, you have to carefully manage your stash of coins. The game also mixes things up with occasional "fish parade" bonus levels, and the rare ability to shoot a superlaser that will take out even the biggest sharks.
Fishing Joy has the relaxing gambling effect of a slot machine--and, like a slot machine, it might occasionally need some replenishing coins (in this case, in the form of an in-app coin purchase, or you can just wait for coins to slowly replenish when you take a break from the game). Fishing Joy won't be for everyone, but it definitely has interesting--and potentially addictive--gameplay.