I don't think fun necessarily has to be a challenge. It just has to be something that's entertaining. Uh, in our, in our type of game, the MMO, uh, genre, it's important, though, that fun doesn't come at the expense of other people. And so it's really tricky sometimes, when you're dealing with open-world situations, where emergent things begin to happen -- uh, where, uh, other players are affecting fun. You -- when you jump into a shooter, you're expecting people to shoot you in the head. You're expecting people to, you know, sneak up behind you, and knife you. You know, that, that, that's part of it. When you're playing an MMO, that's some part of the aspect to it, but when you're dealing with people that are on your team, you know, nothing's more frustrating in a, in a shooter than getting team-killed, you know. So, we call it griefing, uh, in MMOs. You know, nothing is less fun than getting griefed by other players. So, we have to make sure that, you know, that, that fun for one person is not necessarily harming fun for another person. So, it can be really tricky, um -- and because it's different to all people. Some people literally have fun sitting in these games, these MMOs, and crafting. They run around, and they harvest stuff, and then they put it together, and they sell it to other people. Some people have fun working the auction houses, and the economy, and becoming billionaires, sitting on their piles of virtual money, you know, and sort of pulling the strings of the economy in a virtual world. Other people have fun by smashing people in the face. It -- you know, MMOs offer all that, which is really great. I think they're -- uh, uh, it's a really compelling genre, because there's something for everyone in there to really have fun with.