Chariot is the latest freebie courtesy of Games With Gold on Xbox One (unless you're reading this after the event and had to pay for it).
It's a puzzle platformer that brings to mind Spelunky in terms of the exploration aspect and Terraria with regards the terrain you drag/push your titular chariot through. If you lose sight of your chariot for too long, you have to restart from your most recent checkpoint, so where you go, it goes. You're aided by a retractable rope and various gadgets through the levels, the latter unlocked via the store in the hub world.
Each level has an entrance and an exit and you have to navigate the level with a chariot in tow carrying a coffin with a backchatting ghost of a king who magnetically attracts loot jewels and one of three skulls per level. Some levels also have blueprints that are either freely available in the level or contained in crates that you need to keep upright from where you find them to the buzzsaw that opens the crate and provides you with said blueprint.
Some levels have multiple entrances & exits too.
These blueprints might seem optional, but in the case of one pair, you need them to see your way to the alternate exit on level 1-2 and subsequently world 2.
Completing a level unlocks it for a speed run with a strict time limit where you effectively have to flawlessly complete the level. I've tried level 1-1 a couple of times but didn't quite manage to get bronze. There is a speed upgrade available in later worlds, so I'll be revisiting speed runs once I've unlocked that!
Each level also has a co-op jewel, although these are seemingly impossible to reach solo. There is an achievement for getting one of these jewels via solo play, but as yet I've not found one that's yielded to my meagre skills.
Co-op is sadly local only, so you'll need a second controller and a co-op partner to assist.
Anyway, for a free game this is ace with hours of play. It just came at slightly the wrong time of year as I'm knee deep in Destiny & Forza Horizon 2!
If you want a nice relaxing change of pace from all the high-octane AAA titles that're currently around, you could do far worse than this.