K2 is a board game in which each player controls a team of 2 mountaineers, trying to climb to the summit of K2 and return before the other players' teams and before the mountain kills them. Every player uses an identical deck of cards. You use the cards to move your climbers on the route pictured on the gaming board, or to acclimatize the members of your team. 
You can also set up a tent and wait for better weather. You will have to choose your path carefully, as the other mountaineers can block your way, and watch the upcoming weather which can lower your acclimatization to 0, thus killing your climbers.