My younger sister finally got herself a gaming computer, and randomly a month or so ago, she gifted me "Peak". It's a co-op physics game where you climb across several levels of weird terrain. Up mountains, through forests, across deserts, and finally up through a volcano.
It's a lot of fun. Very silly. I have often found us in this weird loop, where we're trying really hard, and taking the game very seriously, only for catastrophe to strike, and it feel like all hope is lost. So then you're in this mindset of
"Oh well, we've already lost this run anyway, might as well throw a hail-mary" and you try something crazy, like using a grappling hook to grab your partner's dead body, and swing it up to a ledge where you can maybe safely revive them.. You try it, expecting failure, hoping to maybe at least get a laugh from watching their corpse rag-doll over, and back down the mountain, only for it to actually work, and now suddenly you've got to switch gears and get serious again because you're back in the game suddenly.
I've "Reached the Peak" twice now. Once on the easy mode, and once on the normal mode.
Now we've moved onto playing "RV There Yet?" which is a similar game, in the sense that it's a physics based co-op game, but in this one you're driving an RV. You have to manage damage and repairs to the vehicle, and ward off hazards like bears, and snakes. It's pretty ridiculous. We came across this broken bridge we kept failing to jump over, and finally she got an idea. The front of our RV had been ripped off in a bear attack, which gave us an opportunity. She held the winch cable, and when we jumped, she lept from the passenger seat, out the front where the windshield should have been, and hooked the winch to the bridge just as it plummeted into the ravine below. We were then able to winch it up and onto the bridge.
If you have at least one friend to play with, I'd recommend both games.