Casting and firing.
Ridiculous Fishing is a game where you;
throw in a hook,
guide it to the lowest depths you can reach,
hook as many fish you can on the return,
break the surface and fling the fish into the air,
then shoot the fish out of the air,
With said profits you can purchase upgrades to your fishing kit, or your hunting artillery, or various hats and accoutrement to enhance rewards and appearance
That's really about it.
Thing is, explaining it in its simplicity does not adequately explain its addictiveness.
I played this on my android phone so the casting mechanic was tied to the tilting and shooting part was tapping all over the place. Wickedly simple, yet it gets its hooks in. You can drop in for literally 5 minutes of playtime and feels like you've taken steps forward for the upgrade dollars. Alternatively, you can waste a huge amount of time aiming for the depths or trying to collect all the wildlife.
I really appreciate the visual style, and the music was fun and catchy. There is a fun, aberrant humour present in the design and gameplay, which is reinforced by both the item and upgrade descriptions and the comments in "Byrdr" (an in game social media app auto-populated with comments from characters, which can be shared out into the twitterverse)
I acquired Ridiculous Fishing in a Humble Bundle, so the price was lost in the middle somewhere. It retails for around the $3 mark depending on platform and I think it's easily worth that price. It's the perfect mix of pick up/put down gaming with the hidden depth for longevity.