Been playing lots and lots of Genshin Impact this last month. Wanted to do a post about it weeks ago, but ended up playing more instead.
Available on PC, Switch, PS4, Android and iOS.
This is a gacha game, free to download and start playing. Money comes in when you want to start unlocking more classes; you can either grind daily quests and live events for premium currency to spend in a slot-machine and hope it spits out new heroes for you to play with, or spend some cash to play the slot machine faster. Payment options include the standard instant money->premium currency, a monthly pass that gives login bonuses each day, and a Battle Pass that gives increasing rewards as you complete objectives in the game. The instant option can be quite pricey, but the other two options are each in the $5 range, which is very reasonable for the amount of hours you'll likely spend playing this game.
Gameplay is heavily influenced by Zelda:BotW. Big open world where you can climb any surface, and lots of little puzzles and challenges around every corner that you can complete for chests full of shiny loot. The world is also full of diverse characters and landscapes, and storylines to experience.
Honestly, you need to play this game. Even if you don't intend to spend a dime, you can still find dozens of hours of excellent gameplay that is 100% free. Very highly recommend.