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A Free Spins slot is casino slot where a bonus round consisting of x free spins can be trigerred, usually with each spin multiplied by 2x or more. I've been playing online slots at casinos for a few years both in my capacity as a player and while testing the various online casinos you see here on this site. I'm a sucker for a decent free spins slot and the best free spins slots for me are those where the bonus round can pay out handsomely, so while there are quite a number of options around the online casinos, some are boring due to the limited payouts. The online slots I have recommended below are in my opinion easily the most exciting casino slots you will find, though hitting the free spins bonus is usually the key to enjoyment. You should be aware that the nature of these slots, in order to provide some big payouts, means that you can go long periods of time without the free spins, then like buses, you usually find 2 or 3 come at once! Hopefully more, and hopefully a "retrigger" during the free spins.

VERY IMPORTANT - USA RESIDENTS
Microgaming software-based online casinos will no longer accept US players after Sunday, November 9th 2008. Players who have registered accounts on or before the 9th November will be able to continue playing. Therefore I would suggest registering at a few NOW before it's too late, even if you aren't sure if you will play there for real. From November 10th 2008, no online casinos using Microgaming software will accept your registration.

Gladiator was launched by Playtech in Feb 2009 - and it's one awesome slot. It takes a lot from a new slot to impress me becuase there are so many out there now, it's hard o find something new. But Playtech have hit the jackpot with this one. Two bonus rounds, free spins, multipliers, scatters, extra wilds in the free spins and graphics to die for. The graphics are what hit you first - video symbols lifted from the Gladiator film starring Russell Crowe, although oddly he's the one character that doesn't appear in the slot! I won't spoil the surprise, but cehck it out for yourself at Bet365 Casino (No Americans!)

The Cashapilla slot arrived at the end of Q1 2008 and offers something a bit differnt...stacked wilds on all reels, 100 paylines, 15 free spins and retriggers plus more panels in view than any other Microgaming slot game. It's definately a streaky slot but some of the rewards can be big and free spins fans will probably find his very entertaining with the stacked wilds adding an extra dimension.

Cleopatra slot is based on the IGT game of the same name commonly found in Las vegas casinos. It's a cool game with the bonuses occurring fairly regularly and consisting of 15 free spins with x3 multiplier. Retriggers are allowed during the free spins and I generally expect 30-40x stake back on average. The reels spin in a random order during the free spins for what it's worth. I find that while it blows hot and cold like all slots, the streaks seem to be a little less. Some of the top wins are a little lower than on other similar games which leads to al longer session generally. Would guess the free spins occur once in every 50 or 60 spins. Wagerworks casinos do not accept US residents at this time.

ISIS is not for the faint hearted, or the poor for that matter, but it can dish out some seriously weighty payouts for the adrenaline junkies. You'll find it has long cold spells with little action but will then spew out 100 or 200 times your bet in one spin, especially in the free spins. 3 scatters awards 20 free spins with a cool 6x multiplier - I normally look for an average of 12,000 coins off this when playing at max coins. 4 or 5 scatters adds an extra 5 or 10 spins respectively, and 5 scatters awards 400x total bet. Retriggers can happen which is a massive boost and while you need a big bankroll to fully enjoy this slot, it does have some amazing moments. Just be prepared for some frustrating waits to go with it! My second favourite slot on the Microgaming platform. Casinos with ISIS.

"Thor" is one of the "Marvel Slots" which comprise Hulk, Blade, Silver Surfer and others licenced to Cryptologic casinos. It's one of two that offer free spins("Blade" being the other) but the only one with 10 free spins at 3x. Retriggers are allowed and it pays out in the medium range so suits most types of player with an average bankroll. very cool graphics on this plus it has a unique advantage in being a Progressive Jackpot" slot with 3 random jackpots that can be won at any time up to £100,000+. Good fun, keeps you going with some decent wins, but no "huge huge" wins aside from the progressive payouts. Casinos with Marvel Slots incl Thor.

Tombraider is a very cool slot, although expect lots of small/medium size wins and fewer massive ones. The advantage is it keeps you going and suits all types of players. The bonus is 10 free spins at 3x, with 400x total bet for 5 scatters. Graphics and sound are second to none and its very playable. If you play all 15 lines then aim to cashout at 2 or 3 x your deposit rather than aim too high. My tip would be play it at 9 lines with a slightly higher bet. Two types of bonus including a "pick 'em" style one too. Casinos with Tombraider.

I can't start to explain how much I like Thunderstruck! Have done ever since 2004 and suspect that maybe it's my Quake FPS gaming background. But I dunno - just a guess! Basically, the Thunderstruck slot is the grandfather of free spins slots. While you play for the bonus round for most of the big payoffs, there are some high rewards for 5 of a kind. The "wild" Thor symbol doubles all wins while 5 scatters pays 500x the total bet. The game allows free spin retriggers and the average payout from the bonus round is around 35x total stake, but 100x or more is not that uncommon. 500x stake is about the best I've had from the bonus round though more is achievable. Free spins occur on average every 123 spins approx, though can act like buses so be patient! Similar slots: "Spring Break", "Ladies Nite" & "The Belle Rock Slot" (at selected casinos only). Click one of the following links to show the best online casinos with Thunderstruck, Spring Break or Ladies Nite. For all the above plus The Belle Rock Slot, check out the Belle Rock casinos.

I am starting to love Hitman. The slot has 3 different bonuses and perhaps surprisingly the free spins bonus in't the lucrative one - the "green calculator" bonus is the one you want. The latter awards up to 270,000 coins at max bet and can provide well over 500x on a good one. The graphics and sounds on this slot are superb - arguably the best of any online slot. You may find it seems slow after a while due to the amazing graphic videos, but you can use "quick spin" in the options menu to skip these after you've had enough of them. Casinos with Hitman.

Avalon is a cool free spins slot. The bonus round tends to pay quite handsomely with the average payout being 40x bet I'd guess. It retriggers a fair bit too. During normal play the wins are small and frequent so its hard to go up by much without the free spins, but conversely it goes down slowly. Also worth noting hat you get an extra wild symbol during the free spins! Avalon is a good fun slot IMO and keeps you going - especially good for lower rollers. Casinos with Avalon.

Aladdin is an RTG Real Series slot. Initially it didn't make a big impression but the more I have played it the more I like it. The 25 free spins aren't guaranteed in the bonus - you get to pick 3,4 or 5 lamps and a genie may appear to award them - but it happens more often than not. Slightly frustrating that you get no monetary award for 3 scatters or more, and that they have to be adjacent on reels 1-3 or 3-5, but it is a good slot for regular payouts and of course has a random jackpot. Is now among my favourite RTG slots. Casinos with Aladdin.

The Desert Treasure slot is a cool free spins slot which offers a bit more of a game for low rollers. I generally find my deposits last a bit longer on this slot, although there are only 10 free spins in the bonus round and they come a little less frequently than one might hope. That said, there is a second bonus round (a pick 'em style bonus) and a good spread of small and medium wins imbetween. Scatters will retrigger the feature and 5 scatters pays 500x total stake. Good sounds, nice ambience and a very good free spins slot so if you never tried it, take it from me, it's among the best.