Block Foundry has four bonus buys: Mega Blocks spins cost 50× the bet, Block Reserve 100×, Mega Blocks 400× and Masterpiece 1,000×. At a $1 bet that is $50, $100, $400 and $1,000. Every buy has the same RTP as the base game, 96.35%, so a more expensive bonus does not return more on average.
Block Foundry is a 6 × 8 cluster slot by Opalin Play, out now on Stake. All figures below come from the game's current math book.
Bonus buy prices at a glance
| Bonus buy | Price | At a $1 bet | What you get |
|---|---|---|---|
| Mega Blocks spins | 50× | $50 | One spin with a Mega Block of any colour, cells at ×2 |
| Block Reserve | 100× | $100 | 8 free rounds, cells start at ×2 |
| Mega Blocks | 400× | $400 | 6 free rounds, cells start at ×4 |
| Masterpiece | 1,000× | $1,000 | 10 free rounds, cells start at ×16, figures on the board |
Prices are multiples of the base bet. The RTP is 96.35% in every mode, and the max win stays 50,000× the base bet whatever you paid for the bonus.
What each bonus buy gives you
Mega Blocks spins (50×)
The cheapest buy is a single spin, not a bonus with free rounds. One Mega Block of any colour lands on the board and every cell starts at ×2. It is the shortest way to see a Mega Block in action.
Block Reserve (100×)
Block Reserve plays 8 free rounds with every cell starting at ×2. Each Charge adds +2 to every cell before the count (instead of +1), and the hopper's collection progress is kept for the whole bonus. When the hopper reaches 65, a giant block covers the board and splits into 48 bricks of one colour.
Mega Blocks (400×)
Mega Blocks plays 6 free rounds with cells starting at ×4. One Mega Block lands in every round.
Masterpiece (1,000×)
Masterpiece is the top bonus: 10 free rounds, every cell starting at ×16. In 2 to 5 of the rounds a complete cube figure is placed on the starting board, the first within the first 3 rounds. A figure pays its value, from 3× to 2,000× the bet, times the average multiplier of its cells. The Rocket can only appear on a board where the cells average at least ×25, and then awards the max win.
In every bought bonus, cells keep their value from round to round, up to ×256. The free rounds need no extra bet, and there is no retrigger: the number of rounds is fixed.
How buying works
Pick a bonus in the bonus menu. It starts on the next spin, with a single debit of its price. Nothing else is charged during the free rounds.
You do not have to buy a bonus. The same three bonuses can start naturally from scatters on the first board:
| Scatters | Bonus | Free rounds | Cells start at |
|---|---|---|---|
| 3 | Block Reserve | 8 | ×2 |
| 4 | Mega Blocks | 6 | ×4 |
| 5 or more | Mega Blocks | 6 | ×8 |
In Standard, a natural bonus comes about once every 130 rounds. Masterpiece can only be bought.
Bonus buys vs modes that stay on
The bonus menu also has two modes that change the price of every spin instead of buying a bonus once:
| Mode | Price per spin | Effect |
|---|---|---|
| Standard | 1× | The base game |
| Bonus+ | 1.25× | Natural bonuses about 1.75 times as often |
| Bonus Hunt | 3× | Natural bonuses about 5 times as often |
These modes stay on until you turn them off. Like the buys, they keep the same 96.35% RTP.
Which bonus buy should you pick?
None of them is "better" on average: the RTP is the same everywhere. The price changes how much one bonus costs and how it plays, not the expected return. A 1,000× buy can end below its price, as can any bonus. Choose a price that fits a budget you set before playing, and stop when it is spent. Gambling is for adults only (18+).
See every mode on the Block Foundry page.
FAQ
How much does Masterpiece cost in Block Foundry?
1,000× the base bet, so $1,000 at a $1 bet. It plays 10 free rounds with every cell starting at ×16.
What is the cheapest bonus buy in Block Foundry?
Mega Blocks spins, at 50× the bet. It is one spin with a Mega Block of any colour and cells at ×2, not a series of free rounds.
Do bonus buys have a different RTP in Block Foundry?
No. Every mode, including the four bonus buys, Bonus+ and Bonus Hunt, has the same RTP: 96.35%.
Does buying a bonus raise the max win?
No. The max win is 50,000× the base bet in every mode. The price of the bonus does not count.
Can I win extra free rounds in a bought bonus?
No. There is no retrigger in Block Foundry: Block Reserve plays 8 rounds, Mega Blocks 6 and Masterpiece 10.
Can I buy Block Foundry bonuses now?
Yes. Block Foundry is out now on Stake. The game page has the rules and the modes.