Action adventure Lara Croft & the Guardian of Light is available right now to play in your browser, if you like. Launched through Square Enix's "Core Online" service, it's free to play with ads, or $10 without ads.
Of course, if your PC is at all decent, you should be able to pick up the PC version for $15 on Steam and play it with enhanced graphics and such. A demo is available on Steam, too, though if nothing else, this makes the game very easily accessible and quick to try out.
Other titles available via Core Online include Hitman: Blood Money and Mini Ninjas.
Hit the source now to begin playing.