(5 years old player comment) Arknights is a great tower defense game—free with no ads, but progression is extremely slow without spending. The $4.99 monthly pass and EXP pack are almost essential unless you enjoy heavy grinding. I spent over $1000 into this game to get 200+ operators. Expedition events arrive every six months but keep getting more complex. If you love a challenge, this game is for you. If you prefer a casual experience, it might be time to quit. I'm tired of complex game modes.

Been playing two years solid. Likable characters, compelling story, involved gameplay, resource management, generous rewards, and a store that's not in your face, just available if you want it. Max characters are possible without ever spending a dime. I payed monthly for over a year, but it doesn't hurt other players or leave them behind, but supports them instead even without the need to friend players. Any one of these would make this a good mobile game, but it does them all better than others

Honestly my favourite gacha I'd try to recommend to anyone, cute simple art style and captivating story while being beginner friendly with numerous early on rewards, it doesn't feel like you are left behind. Along with having a very fun and unique play style of combining 12 operators and not just relying on one operator to beat stages. Would love to see more multiplayer established events or options in the game but absolutely love it for how it is.