In next year's 'Iron Man 2,' Don Cheadle, who takes over for Terrence Howard in the sequel, says the movie's technical complexities were an unforeseen challenge for the veteran actor.

"The special effects, the amount of things that happen, the amount of CGI," Cheadle told Moviefone at Thursday's Ante Up for Africa event outside L.A., to benefit Darfur charities. "It's like getting to play with the best toys at the best level.
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