Grab a Mystery Bonus at Two Online Casinos!


NJ online casino bonuses come in many different sizes and varieties, but one that is invariably a big hit with players and frequently crops up at both Harrah’s Online Casino and Caesars Online Casino is the Mystery Bonus. It’s been a while since either of these casinos offered it so we could say it’s overdue. But this weekend–to make up for lost time–you’re getting a special treat: a guaranteed Mystery Bonus at both and at the same time!

The two offers are not identical. But they do share two important features in common.

They are both mystery bonuses.

All you know ahead of time are the various possibilities. The casino is not telling you ahead of time how much your own bonus will be.

They are both guaranteed for everyone who participates.

Everyone who participates in the promotion gets a bonus. In other words, your bonus                      is guaranteed.

This Weekend’s Mystery Bonus Offer at Harrah’s Online Casino

The Mystery Bonus promotion started on Thursday, August 16 and runs through Sunday, August 19. All registered players who make a qualifying deposit during that time period will receive an instant Mystery Bonus of either $10, $25, or $50.

How to Participate

If you wish to participate in this promotion, these are the steps you need to follow:

  • Log into your account during the 8/16-8/19 promotion period.
  • Make a qualifying deposit, as specified on the marketing collateral, using the bonus code MYSTERY.

As soon as your deposit is received (deposits made at the Caesars Atlantic City casino cashier’s cage or through PayNearMe don’t count), you will be randomly awarded one of the following bonuses:

  • $10
  • $25
  • $50

Since all bonuses will be awarded randomly, the size of your deposit will have no bearing on the size of your bonus. The bonus will be credited to your account instantly.

Wagering Requirements

Before you will be permitted to withdraw either the bonus itself or any associated winnings, you will need to meet the casino’s wagering requirements. Depending on your game choice, the amount you need to wager is as follows:

  • Slots: 5x bonus
  • Roulette: 25x bonus
  • Video Poker or Blackjack: 50x bonus

Therefore, if you are lucky enough to receive the maximum bonus of $50, the amount you will need to wager will be as follows:

  • Slots: $250
  • Roulette:$1,250
  • Video Poker or Blackjack: $2,500

The casino is giving you up to seven days to complete the wagering. As soon as the bonus is cleared, assuming it hasn’t yet expired, your bonus and any additional winnings wagering it (or whatever you have left) will be available for withdrawal. However, cancelling the bonus, premature attempted withdrawal of unavailable funds, or failure to complete the wagering within the allotted seven days will result in forfeiture of both the bonus and any resulting winnings.

This Weekend’s Mystery Bonus Offer at Caesars Online Casino

The Mystery Bonus promotion started on Friday, August 17 and runs through Monday, August 20. It is open to all registered players.

However, unlike the Harrah’s Mystery Bonus, the mystery regarding what your bonus from Caesars will remain a mystery until Thursday, August 23. On that day, a random drawing will be held to determine the size of each player’s prize. The four possible prizes are $5, $25, $100, and $250.

How to Participate

If you’re worried about possibly not being able to afford this promotion, don’t be. In order to receive your first entry into the drawing, all you need to deposit is $10.

Or, if you prefer, as many players probably will, you can earn additional entries based on the number of online Tier Credits earned during the promotion. For every 15 Tier Credits earned, you will receive one additional entry into the drawing, up to a total maximum of five entries.

Keep in mind that it is the amount of your play, not the size of your deposit, that will determine your entitlement to additional entries. So only deposit more than $10 if your account balance otherwise won’t be enough for your usual level of play. As always, deposits made at the Caesars Atlantic City casino cashier’s cage or via PayNearMe don’t count.

As soon as you are ready to get started, these are the steps you need to follow:

  • Log into your account anytime during the August 17-20 promotion period.
  • Click on “My Account” and then on “My Bonuses.”
  • Enter the code MYSTERY and click on “Get Details.”
  • Look for the Mystery Bonus offer under “Available Bonuses.”
  • Click on “Deposit” next to the bonus. Then make a deposit of $10 or more to receive your first drawing entry.
  • Play your favorite games to earn up to five more entries.

Distribution of Prizes

As mentioned above, even though the promotion ends Monday, you won’t get your bonus on Monday. That won’t happen until Thursday, the day of the drawing.

Until then, rest assured that whatever entries you have earned will be included, and even if the bonus randomly picked for you is nowhere near as big as you were hoping for, you will still get something. Nobody walks away from this promotion empty-handed. The table below shows how the various prizes will be distributed.

Mystery Prize Drawing:

Prize Matrix 

Winners Prize Estimated Value
1 Winner Online Bonus Play ($250) $250
5 Winners Online Bonus Play ($100 per player) $500
Online Bonus Play ($25 per player) $1250

   Everybody else                                      Online Bonus Play ($25 per player)

All bonuses will be credited to players’ accounts by 5 p.m. next Thursday.

Wagering Requirements

Like all other bonuses awarded to players at Caesars Online Casino, the Mystery Bonus being handed out next Thursday comes with certain wagering requirements.

Depending on the type of game you select, here they are:

  • Slots: 5x bonus
  • Video Poker: 10x bonus
  • All Other Games: 25x bonus
More Good News

If you are a frequent player, you should be very happy because these are the exact same bonus multiples for both the bonus and deposit combined you see for most other bonuses at this casino. However, in this case, the wagering requirements gets reduced significantly since they are based only the bonus.

The casino is giving you up to seven days to clear the bonus. That’s what you need to do to free up both the bonus itself and any resulting winnings, because until the bonus is fully cleared, these monies will be temporarily locked into your account and unavailable for withdrawal. Keep in mind that cancelling the bonus, premature attempted withdrawal of unavailable bonus funds or winnings, or failure to complete the wagering on time will result in both the bonus and any winnings therefrom being forfeited.

However, most players shouldn’t have any problem at all. The lower wagering requirements, combined with the ample time to complete them of up to a full week, should make clearing the bonus a lot more feasible for all levels of players.

The Bottom Line: Why Both of these Mystery Bonus Offers Are Too Good to Pass Up

I can’t imagine any gambler at heart who doesn’t love a good mystery, especially when it has a happy ending like both the Harrah’s Online Casino Mystery Bonus and Caesars Casino Mystery Bonus do.

Another great feature is that both casinos have gone out of their way to make these promotions affordable to virtually everybody. Thanks to built-in features like minimal required deposits, reasonable wagering requirements, and for the Caesars bonus, a very reasonable cap on the maximum number of entries per person, no one is shut out.

On top of all that, not only is each and every participating player guaranteed to get a bonus, but because both Caesars and Harrah’s Online Casinos are part of the Total Rewards network, all of your play for both promotions allows you to earn additional Reward Credits and Tier Credits.

If you only play at one of these two casinos or only have time to access one bonus this weekend, you’re still ahead of the game. But if you can manage to get your hands on your guaranteed Mystery Bonus at both casinos, that’s even better. You could be celebrating with up to $300 in bonus money!








Barbara Nathan is both a professional writer and casino, poker, and sports betting expert. Originally from NYC, she relocated to Absecon, NJ in 2013 just prior to the official launch of New Jersey regulated online casino and poker gambling. Besides keeping tabs on important developments in the industry from day 1, Barbara is very familiar with what each NJ online casino has to offer. Her comprehensive, unbiased reviews and promotion descriptions provide a valuable service to NJ online casino players. Barbara also enjoys volunteering in the Atlantic City community. She is a certified literacy tutor at the Atlantic City Public Library.

Lost Password

Privacy Policy