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All games › The games › Hollow Oak Vault

Hollow Oak Vault

Behind a tiny round door, a storeroom is carved into the heart of an old oak. A bold machine: a pair of Leaf Knockers on a blank spin gives reel five one more turn, and free-spin wins pay double.

15 linesLast-reel respinHigh volatilityFree account worldCoin RTP 95.9%
Free account

Sign up to play Hollow Oak Vault

The games are free and will stay that way. The account holds on to your 100,000 coins, favourites, level and daily missions between visits — and lets us check you are 19 or over before you spin.

  • 100,000 free coins on the first climb
  • No card and no checkout anywhere in the village
  • A single balance for every treehouse you can open
  • No installing — it runs entirely in the browser

Virtual coins only. No gambling for real money, no prizes of real-world value, no in-app purchases. 19+.

No card, no payment details, no shop. Coins are worth nothing outside the oaks and can never be cashed out.

Already up in the oaks with us? Log in.

About this world

Hollow Oak Vault

Hollow Oak Vault is the most dramatic world in the canopy. The Beam Bat and the Oakheart Chest hold most of its value, so the storeroom can stay quiet for a while before it opens up. The Acorn Wreath wild covers any symbol apart from the Leaf Knocker. When a paid spin misses with two knockers showing, no more and no fewer, the fifth reel turns once more by itself, free, looking for the third. Three knockers open nine free spins with doubled wins, four open fourteen and all five open twenty-two.

Second Knock. If a paid spin pays nothing and shows exactly two Leaf Knockers, reel five spins once more on its own for free; every free-spin win is doubled.

The honest part

Only coins, every time

Everything up here runs on free virtual coins. No real-money gambling takes place, nothing you win has real-world value, and no in-app purchases exist. A random number generator decides results; earlier spins never touch the next one.

Measured by running this page's own engine for 5,000,000 spins: coin RTP 95.9%, hit frequency 32.5%, free spins about once in 88 spins, a win of 10x your stake or more about once in 84 spins. Coin figures only — no money is staked or returned.

How to play

Hollow Oak Vault in three steps

1

Sign in, duck through the round door into the hollow trunk and set a stake.

2

Spin. If a paid spin misses while showing exactly two Leaf Knockers, reel five spins once more on its own, free.

3

Three Leaf Knockers open nine free spins at double pay; four open fourteen and five open twenty-two.

Who it suits

Patient players who are happy to sit through a quiet spell for the occasional big moment.

What to expect

The widest swings in the village. The bat and the chest carry most of the value, so wins often come in bunches with quiet stretches between.

Symbol guide

What pays in Hollow Oak Vault

CarvingFive along the boughThe same, as a share of your stake
Acorn Wreath (wild)6,000× line bet400× your stake
Oakheart Chest3,400× line bet226.7× your stake
Beam Bat1,600× line bet106.7× your stake
Amber Keyring1,000× line bet66.7× your stake
Round Door550× line bet36.7× your stake
Pinecone Jar320× line bet21.3× your stake

The five card ranks (10 to A) pay the least. Three Leaf Knockers anywhere open the free round. Full values for three and four of a kind are in the paytable.

Questions

About Hollow Oak Vault

Only after a paid spin with no win that shows two Leaf Knockers exactly. Reel five then turns once more at no cost.

Yes. Every win in the free round pays double, and new knockers during it add more spins.

That is how it is built: the rarest symbols carry the largest wins, and the machine never saves up or holds back a result.

Today's missions

Four little jobs, free coins

Missions refresh daily and count in every treehouse. Doing them is up to you.

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19+ onlyFor adults over legal gambling age. Not directed at under-19s.
No real moneyNo real-money gambling is offered or promoted here.
No prizesNothing won has real-world value. Coins cannot be withdrawn.
No purchasesNo in-app purchases. Every coin is free.

Play for the fun of it, and stop once the fun runs out. Pick a time limit before you start and take breaks. If gambling of any sort is causing you trouble, ConnexOntario is free and confidential on 1-866-531-2600, at any hour, or try the Responsible Gambling Council and CCSA. See our responsible play policy.

19+

Every coin up here is play money. Nothing in these branches is real-money gambling.

Treetop Acorn Club is open only to adults aged 19 or over. All the games run on virtual coins with no monetary value, and those coins cannot be bought, sold, withdrawn or exchanged. You will find no coin shop and no payment page on any plank of this site, no prize of real-world value is on offer, and success here does not imply future success at real-money gambling.

No real moneyNo prizesNo in-app purchasesNo withdrawals19+ only

Free, confidential gambling support, any hour: ConnexOntario 1-866-531-2600, 24 hours a day · CCSA · Responsible Gambling Council · How we keep play sensible