Ok... I've finished the "official" game today (it was REALLY short) and the game explains what happens with Nightcrawler and why he isn't in X-Men 3. Ready for the answer? Nightcrawler enter's Charles "office"... Charles: "hmm, you're leaving" Nightcrawler: "This isn't my life" Charles: "Fine Kurt, know that we'll have the doors open in case if you want to return" And THAT'S IT. That's the reason why Nightcrawler left the X-Men. Really lame.