Halo: Combat Evolved would've been their next Mac title, but Microsoft bought them out and turned it into a launch title for the Xbox. In the 1990s, Bungie gave Mac users a reason to be proud with Marathon and Myth. ICOM Simulations created the first fully mouse-driven Adventure Game in Déjà Vu, followed by Shadowgate and two other 'MacVentures'. Silicon Beach's Enchanted Scepters and Dark Castle demonstrated the Mac's mouse-based input and multimedia capabilities, respectively. Several companies stepped forward to fill the gap. After the launch, games were ported over from other systems, but there were only a few unique titles. So the only games developed for it prior to its release in January 1984 were a 600-byte 15 Puzzle and a real-time board game by an Apple programmer that went intentionally underpromoted. The Mac was a revolutionary computer, with its Xerox Alto-inspired graphical user interface note though Mac OS X made it so modern Macs have a terminal feature to provide text-based functions other UNIX-based operating systems have, and Apple marketing executives were worried that it would be seen as a toy.