Rainbow Six Cheats for DreamCast

Team God mode
During gameplay press Analog-stick Left + D-pad Down + A to toggle invincibility for your entire team.
Avatar God mode
During gameplay press Analog-stick Up + D-pad Down + A to toggle invincibility for your character while leaving the remaining members of your team normal.
Heavy breathing
During gameplay press Analog-stick Down + D-pad Down + A to toggle heavy breathing.
Big head mode
During gameplay press Analog-stick Up + D-pad Down + X to toggle big head mode.
Mega head mode
During gameplay press Analog-stick Left + D-pad Down + X to toggle mega head mode.
Polska mode
During gameplay press Analog-stick Down + D-pad Down + X to change the faces of your team.
Stumpy mode
During gameplay press Analog-stick Left + D-pad Down + Y to toggle stumpy mode.
Brains mode
During gameplay press Analog-stick Up + D-pad Down + Y to toggle the AI of your team.
Side scroller mode
During gameplay press Analog-stick Down + D-pad Down + Y to toggle becoming thin as the trees.
Clodhopper mode
During gameplay press Analog-stick Left + D-pad Down + B to toggle clam pincer hands.

Victory Conditions: while playing the game,press analog-stick up + d-pad down + b this will prevent the mission being lost if you trigger an alarm or a hostage gets killed.