Sorry, this post is OPPOSITE to the thread title, but because it has been debated many times in this thread, I though I'd put my spin on it. What I'm going to suggest is probably more in line with multiplayer, but is still a single player concept. (what does that mean???) Well considering KSP is indeed a game of skill (no mods that is), a player may want to have a refuelling space station, but not the know how or patience to build one. Sure you could hack one in, but here is my idea. Perhaps on the KSP website, you have a section for the player to place a contract request for a given space mission. Other players could then bid to win the contract. The winner, would then be able to login to the original players KSP (exchange a one time key via Email or something) and be able to build and fly the mission. The contract requester would be able to watch in real time, as the whole mission unfolds. The vehicle placed in orbit, would of course have a logo on its side, revealing the player that built and launched the vehicle. Wild idea I know, but it would allow for a more interesting contracting system in the game. Whether the contract is for REAL money, or game money, or simply the prestige of winning contracts and fulfilling the requirements by demonstrating your skill in KSP. Of course there would be a few players out there that dominate the contract business, but hey, that happens in real life too. Then of course you might have the kamikaze players too, so you would have to select contractors based on their credibility not just the lowest bid. Not sure how you could enforce the payment though, other than to lower someones credibility should they "grief", or if the contractee doesn't pay.