Provider:
SpinPlay Games
Green stretches the reels to six symbols high and plays 40 lines, red starts collecting clovers towards five fixed jackpots, purple runs an active multiplier that reaches x5. Which one arrives depends on the Coins sitting in the pots when the feature fires, and every version of it deals ten spins.
Every Coin that lands collects to the pot of its own colour above the reels, and the mix sitting in those pots when the free spins fire is what decides which round I get. 3 Lucky Rainbows Action Boost SpinUP from SpinPlay Games has been vaguely founded on the Irish fortune theme, and it's a rainbow carnival stuffed with gold coins. The three rainbows beside the grid are Green, Red and Purple, and a Coin landing on one of them is what starts the feature. Players meet four coloured coins, each with their own distinct power. Green, Red, Purple and the Multiple Coin each open a different version of the same round.
Players keen on the pots-of-gold genre will be entirely comfortable with 3 Lucky Rainbows Action Boost SpinUP, and joining the reels are jackpot ladders, clover collections, and multipliers. Every Gold Coin that appears also collects to the Gold Hat while you play. They become clearer when you've watched them operate a handful of times. I held my stake at 10.00 throughout, and the free spins are played at the same bet as the spin that triggered them. Beside the reels sit the three rainbows encouraging players on as they spin, while the grid itself is composed of a 5x4 grid carrying 20 paylines. These pay left to right from the leftmost reel on neighbouring reels. Inside the free spins, which of the rainbows stay active is set by the Action Boost SpinUP that was awarded.
Raising the stakes, even further, is a win multiplier. It belongs to the Purple Coin round, where each upgrade handed over by a Rainbow Spin moves it a step. It opens at x2 and rises with each upgrade, to x3 with one and x5 with two, and the multiplier applies to line wins and to bonus cash prizes equally. It never touches the jackpots, not even in the Multiple Coin round where all the variants run at once.
Players need to brace for a downpour of gold when they crack open the paytable, and I noted the wild, the rainbow. Below it come the clover, the beer mug, the shoes, the harp and the fiddle, with card ranks from 9 up to Ace filling out the rest. It can stand in for everything except the Bonus symbols, it also delivers a top line payout of 20.00 credits for a set of five, and it appears stacked on all reels. In the Green round, any reel showing a wild is nudged until every position on it is wild, and the win is only paid once that nudge has finished.
3 Lucky Rainbows Action Boost SpinUP has features galore contributing to the total chaos of the game, and on any spin, a Gold Coin may trigger the Rainbow Spin. The animation the coin plays has no bearing on whether it fires. One Rainbow Spin is granted with all three rainbows active. Coins can arrive with no upgrades, with one upgrade or with two. Coins landing on the rainbows trigger the free spins, and there are four coin variants, depending on which lands:
The one to watch is the clover collection in the Red Coin variant, because when completed, it pays one of five set jackpots. At the 10.00 stake the panel listed them as Mini 50.00, Minor 100.00, Major 250.00, Maxi 2,500.00 and Mega 50,000.00 credits. The collection is composed of five levels which are completed like so;
The chief aim of 3 Lucky Rainbows Action Boost SpinUP is landing coins on the rainbows. A Coin can also turn up on an ordinary spin and simply collect to its pot with nothing else following. That triggers the main Action Boost SpinUP Free Spins feature, and when this occurs, players are awarded 10 free spins in every variant — Green, Red, Purple and Multiple Coin. All four of the rounds I hit ran to that same 10.


The coins carry into the free spins as outlined above. In a Red round the ladder of clovers sits down the left of the screen and fills a step at a time, and the Gold Coins show their credit values — 10.00 and 40.00, adding to 50.00 — before the win is paid across. But now they also grant more spins, and players receive one, two or three additional spins per Gold Coin award in the Purple variant, and two whenever an upgrade lands in the Multiple Coin variant. The Rainbow Spin inside the Red round can instead boost a jackpot value for the spins that remain, or cut the clovers each level needs. There is no retrigger of a new 10-spin round. Collecting a jackpot resets the clovers gathered for it, so a level can be worked more than once inside the same round.
Minty’s Closing Thought: Four Action Boost SpinUP rounds landed across 390 spins, the largest of them paying 55.0x the stake, and the balance closed at 100,006.00 against a 99,825.00 start. SpinPlay Games keeps the cabinet in rotation — Action Boost 3 Lucky Rainbows dates from 2023 and 3 Lucky Rainbows Action Boost Max from 2025.
A great deal is happening here. The bonus supplied 912.00 of the 4,081.00 I won back, around 22% of the total.
These sorts of games are all about building a streak. Coins lead to Rainbow Spins, to upgrades, to free spins, and further. Each Green upgrade adds further wilds to the reels from the following spin onwards, for the rest of the feature. Across 390 spins at 10.00 a spin the bonus showed up four times, the largest of them worth 55.0x the stake. The gaps between them ran 18 spins, then 197, then 25. The session finished at 104.6% with a high point of 100,300.00. The balance dipped to 98,885.00 along the way, from a start of 99,825.00. One barren stretch reached 13 spins, and 56 of the 113 paying spins returned less than the stake. The single biggest spin was 770.00 on spin 323, 77.0x the stake, with no bonus attached to it.
When it goes, it can definitely go wild. On spin 112 the bonus paid 200.00 while the base game added 12.00 of its own on the same spin. Frequently when 3 Lucky Rainbows Action Boost SpinUP gets moving, I had no clear read on what was occurring, even having read the rules screens.