online slots' bonus games

There are many online slots with interesting bonus games both on additional screens, and on the reels of slot machines. We choose the most interesting bonus games to publish their reviews on SlotsBook.

Some slots players search bonus games on the reels, but probably you search bonus games on the second screen. Our review of bonus game is the description of process of bonus game and view the large screenshot of this bonus game.

Now look the list of available reviews below. Choose to read.

arcade game

Hit 3 Monkey symbols anywhere on reels 1, 3 and 5 simultaneously to trigger Progressive Bonus Game in Banana Monkey Slots, where you will collect all 25 bananas and win progressive jackpot.
Play the Alien Hunting Bonus with elements arcade games: 2 levels of complexity.
Run Forrest Run! Score a Touchdown to win prize in cash.

cashback

dice board game

expanding wild symbol

You can win Scarab Attack feature on The Mummy Slot where two additional wild symbols will be added, if you hit wild symbol on reel 3.
Convert the wild Mummy symbol into Expanding Mummy Wild on The Mummy Slot. It's one of the PlayTech new slots.
Hit lion symbol on reel in winning combination to activate Expanding Wild Symbol.
Any Joker in winning combination expands on reel. Joker is expanding wild symbol on Double Sevens Slot.

extra bet

Power Spins on Atomic 8's slot can be played only with extra bet. During power spins feature the wins pay combinations left-to-right and right-to-left.

extra wild

free respin

free spins

Player is awarded 10 free spins on Jekyll and Hyde slot if you hit 3 scatter symbols.
You can win up to 75 free spins on Wild Safari slot game.
Stacked, Expanding and Traling wild symbols are additional feature during 25 free spins on Santa's Wild Ride slot. Also all wins are doubled during this game.
15 free spins is a bonus feature on Dark City Slot
Win fifteen free spins in the Free Spins bonus game. All wins during the free spins are doubled.
You can win 8 free spins if you collect four bananas to the reel's basket in Banana Monkey Slots.
You can receive 15 free spins in Free Games if you hit 3 bonus symbols on the reels in Bonus Bears Online Slots.

gamble

Double-Up Game is a gamble game on Hot Tequila Slot. Try it!
Double your wins in Double-Up Game.
If you win on regular spins in Banana Monkey Slots, you receive chance to increase this winning in Gamble.
Pick red or black to double your win in Gamble feature.
Any win activates gamble game in Frankie Dettori's Magic Seven Slots. Pick a higher card to increase your winning.
Choose red or black to double a prize.
Increase your win up to $1,000 in Camble.
Click red or black to increase your win.
Select correct color or suit in gamble on Bearly Fishing slots.

lotto

lotto progressive sidegame

match multiplier

multilevel pick a box

We invite you to tea party to increase your wins! It's multi-level bonus game on Alaxe in Zombieland online slot.
Hit three magnifier on It's a Mystery Slots to win Portrait Puzzle Feature

multilevel pick until collect

multilevel pick until pop

It's a main bonus feature on the Mummy Slot. It's triggered randomly and activate other bonus features. Also you can win cash during Lost City Adventure Bonus.
2,400 coins is possible prize in bonus game. Play three levels to win it. If you find a POP symbol the game over.

paid respin

pick a box

Increase your line bet in 3000 times during Super Hammer bonus game.
Choose voltage meters to electric shock in the Electrifying bonus game.
Everyone honey pot which will be found by a bear on a tree, gives you a prize in Honey Bonus.
See videos from the movie as Rocky Balboa 'The Italian Stallion' battles vs opponent on a ring to win cash in each round for you.
Find Aladdin's Lamp to win bonus prize in coins.
Pick gifts to win Christmas cash prize.
Choose black or white rabbit to win bonus prize.
Three briefcases give you bonus prize in cash.
Win $20,000 in bowling green bonus game.
Catch the villain and collect bonus

pick a box - free spins

Pick a winning horse to win free spins.
Choose the Cabaret dancer to win free spins feature.
free spins (up to 25) + random multiplier value (up to 4x) + wild symbols (up to 3) = your possible win up to 80,000 coins in Monkey King bonus game.
Pick one of the eight wonders of the world to win free spins.
Pick a gold mine to win up to 25 free spins.

pick a box on reels

Pick a dolphin to win up to 800,000 coins in the Wild Dolphin bonus round.
Pick from one up to three bonus symbols (Uncle Sam's top hat) to win up to 47 500 coins in Hat Bonus Game.
Pick a box of chocolates to win free rounds!
Click on one of the gold sacks on the reels to collect your bonus.

pick until collect

pick until match bonus

pick until pop

Pick gravestones to win more coins on Alaxe in Zombieland Slot. Gravestones Feature is 'pick until pop' style game.
To win more in Jazz Jam Session Bonus Round the instruments must play a tune in harmony.
Click on alien eggs to collect your cash prize. When you hit 'headjumper' evil alien, the bonus game is over.
Win all seven trophy plus prize in cash on Magic Seven Bonus.
Win free spins + cash prize + progressive jackpot on Pick a Plate Bonus Feature.
Samurai vs ninjas. Hit the ninja in bonus game of Silent Samurai online slots to win up to 27 free spins.

pick x of y

plinko

scatter

Hit three bonus symbols on screen to trigger Cool Jazz Money Scatter Bonus. It will be played on the reels only.

scratch and match

The clothing disappears from the beautiful sexy alien and you win up to 12,000 coins in the Sneak-a-Peek Bonus Game.

slot game

Win up to 25 free spins on bonus game.

stacked wild symbol

stop and win

wheel of fortune

This game offers four-level progressive jackpot: Mithril Progressive, Gold Progressive, Silver Progressive, Bronze Progressive. Spin a wheel fortune to win one of them.