LunarHex

It's definitely worth investing in the previous game's missions. Each set of levels has a different flavour—demonstrating the progression of IO as designers as they work to figure out what modern Hitman should be. As a full trilogy package, Hitman World of Assassination has a truly absurd amount of things to do—not least of which is the more recent Freelancer mode, which turns the game into a compelling roguelike that challenges you to switch up how you play.

There's a real joy in the well-built sandboxes that Hitman evokes over and over again with its intricate levels and deep stealth system. The answer to "can I kill this target in this way?" is almost always "yes" but the more fun question is how on earth to make it work. Solving those puzzles is what keeps me up for hours, never growing bored even as I'm crouched on the second floor landing of Dartmoor's stuffy library.