What's a good iOS game for some quick, casual, online multiplayer action?

If you're looking for something that's easy to jump into and doesn't require a huge time commitment, slither.io is worth checking out. The concept is simple: you're a snake, you eat glowing orbs to grow bigger, and you try not to run into other snakes. But the online multiplayer aspect is where it gets interesting. You're constantly competing with other players to become the biggest snake on the server. The controls are smooth – just swipe to steer – and the game loads in about 2-3 seconds on my iPhone. It's surprisingly polished for a free game, and I've wasted way too much time playing it while waiting for builds to compile. The dev team really thought about making it accessible. No crazy graphics or complicated mechanics, just pure, simple fun. Plus, it barely uses 50MB of RAM, so it won't kill your battery.