#8
Half-Life 2: Deathmatch is a bit of a strange beast. It's essentially a stress test for Source engine physics—radiators and filing cabinets flying at your head alongside the actual gunplay. The ~4GB footprint barely dents a small SSD and frame rates on iGPUs are excellent. LAN and bot support mean you don't need an internet connection or live players to get sessions going. The honest caveat is that public matchmaking is thin; I've jumped in during off-peak hours and found only a handful of active servers. It's a better party game than solo queue game, and works best when you're setting it up for a small group.