do i have to sign into a live acount to play halo 2 on singleplayer???

He meant for single play. For multiplay yes, you have to have an account. Silver lets you play, gold lets you do quickmatch.
 
Are you talking about the XBox 360 or PC version? The 360 version wants you to create a profile that you must sign into in order to play the single-player version. It's not a live account, it's just a player profile like most other games...
 
Same goes for the PC version, its just a profile, not a Live account. So the answer to the original question which was "do i have to sign into a live acount to play halo 2 on singleplayer???" is no you do not have to sign into a live account to play halo 2 singleplayer.
 
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