If you're heading back to K2 Climbing Simulation, there's one promo still worth grabbing. It hands over 100 Points, the in-game currency you'll spend in the Store on gear for your next run at the mountain. Honestly, though, that's it. Every other code we've had on the list has expired.
Points show up in the bottom-right corner of your screen. You can blow them on fresh equipment, which matters whether you're climbing with friends or going solo. K2 isn't Everest, but it's still the second-highest peak on the planet, and the weather doesn't mess around. A little extra gear can go a long way.
Redeeming the code isn't complicated. Tap the Redeem gift icon on the left side of the screen, then use the text box in the Redeem Codes menu. Type the promo, hit Enter or the Magnifying Glass, and your Points should land. Codes here aren't case-sensitive, and they're short enough that you won't need to fight with them.
The active code count tends to bounce around, so don't be surprised if things change. Expired promos pile up over time, and that'll probably keep happening. Best move? Use the working one while you can.
And if you want rewards that work across Roblox experiences, there are separate Roblox promo codes out there too. Those aren't tied to K2 specifically, but they can still be handy.