Yeah, another user who prefers D2K over Protector. I love the 2000 mode, and exactly: you have to learn to play it and often use the radar, then the game begins to kick ass. I got around 4.1 mio to Level 71. The game is extremly challenging, especially when you lose all humans and get to the "underworld". But it has the same unique appeal then Tempest 2000 and you can't stop playing, when you're "in the flow"