I'm having a bit of trouble as a DM figuring out exactly how this works with a bluff check. What I am doing now is...
1) Letting the player make a bluff check to see if he can sneak attack a creature who is not flat-footed or being flanked. This is counted as part of his attack, so his attack and bluff check is rolled into one standard action.
2) Resisting that with a sense-motive check from the creature.
3) If he beats the resisted check, then I allow the sneak attack. If he fails, then he uses the entire standard action in that failed bluff check.
Am I doing it wrong?
Mainly the reason I ask is because most creatures I have them fight end up with none, or next to none bonuses to sense motive, and the rogue player has something like +8 to bluff. Does this mean that he is a virtual damage machine and I should crank out more undead and constructs to prevent the party from steamrolling everything?