Block Forge: a complete guide to the 8×8 block puzzle

Block Forge is a block puzzle for iPhone. The board is an 8×8 grid, you get three pieces at a time, and one rule does most of the work: fill a complete row or a complete column and it bursts.

There is no timer and no move limit. The pressure comes from the board itself, which makes it the kind of game you can play for two minutes in a queue or for half an hour on the sofa.

This guide covers what the game asks you to understand: how the board behaves, what each mode is for, how combos and boosters work, and a few habits that make long runs easier.

How the board works

Three pieces sit below the grid. Drag any of them onto the board in any order. Pieces cannot be rotated, so the shape you see is the shape you place — the puzzle is in choosing where, not in turning things around.

Fill an entire row or an entire column and it clears with a burst. Fill both with a single placement and both clear at once, which is where the larger scores start.

A run ends when none of the three pieces in hand fits anywhere on the board. That is the only way to lose: no timer, no lives, no energy meter waiting to refill.

One design decision worth knowing about: the piece generator looks at your board. It will not hand you a trio that cannot be placed at all, so a run ends because of how you filled the grid, not because the game decided it was over.

The three modes

Levels — 60 boards with a goal. Each level has its own target and three stars to earn. Levels are the structured half of the game: a fixed board, a number to reach, and a reason to replay the ones where you got two stars instead of three.

Endless — one more move, every time. No goal and no end, just the board and how long you can keep it breathing. This is where personal records happen and where boosters earn their price.

Daily Challenge — the same board for everyone. A fresh board is seeded every day and you get one attempt at it. Keep showing up and a streak builds. It takes about five minutes and it is the reason a lot of players open the app at all.

Combos and multipliers

Clearing lines on consecutive placements builds a streak, and the multiplier climbs with it, up to ×5. A single clear is worth having; three clears in a row is worth planning for.

The practical consequence: a placement that clears a line now is usually better than a placement that sets up two clears later, because the next trio is unknown. Take the certain clear, keep the streak alive.

Boosters: Hammer, Swap and Undo

Three boosters, bought with coins, usable in any mode:

• Hammer — 30 coins. Removes a single block. Best used on the one square that is blocking an otherwise complete row.
• Swap — 50 coins. Replaces the three pieces in hand with three new ones. Worth it when the whole trio is awkward, not when one piece is.
• Undo — 40 coins. Takes back your last placement. Save it for the mistake that creates a hole you cannot reach.

Coins and what they are for

Coins come from playing: finishing runs, the daily reward, and an optional video in the shop if you want more. They can also be bought outright. They are spent on boosters, and nothing in the game is locked behind them permanently.

Block Forge is free with optional ads and in-app purchases, and a single purchase removes ads for good.

Six habits that make runs last longer

1. Place the biggest piece first. Plan the trio around the shape with the fewest legal positions, not around the one that is easiest to place.
2. Keep one 3×3 area clear at all times. The 3×3 square is the piece that ends runs. If there is nowhere for it, the run is already over — you just have not seen it yet.
3. Work along the edges, inwards. Holes in the middle of the board are the hardest to fill and the easiest to create by accident.
4. Prefer the clear you have over the clear you are planning. The next three pieces are unknown, so certainty beats setup.
5. Watch the fill level, not the score. When the board passes roughly two thirds full, switch from scoring to survival: clear whatever you can, wherever you can.
6. Spend Swap on the trio, Undo on the hole. Each booster has one job it does better than the others; using them interchangeably wastes coins.

Block Forge is on the App Store, free, in 17 languages.