Here's the language directly from Harrah's Tahoe's webpage on the current multiplier promotion (
https://www.caesars.com/harrahs-taho...dit-multiplier)
MYSTERY REWARD CREDIT MULTIPLIER
MULTIPLY YOUR REWARDS UP TO 40X
Feb. 2, 9, 16, 23
§ 5X – 40X Reward Credits on Slots & Table Games
§ 3X Reward Credits on Video Poker
Reveal your GUARANTEED Reward Credit Multiplier when you swipe your Total RewardsŪ card each day at Harrah’s or Harveys Promotional Kiosks
So as I said before, it's best to check the T&C for each of the promotions.