Prism Blocks

What it is

Prism Blocks is a block puzzle on an 8×8 board. Three pieces wait in a tray below the board. You place them wherever they fit, and every row or column you fill completely lights up and clears. There is no timer and no rotation. The game ends when none of the pieces in your tray fits anywhere.

The pieces are cut like gems. Each colour also carries its own small mark, such as a ring, a triangle or a cross, so the colours stay easy to tell apart even if some of them look alike to you. When a line clears, a band of light sweeps across it and the cells break into shards. The sound rises in pitch as your combos grow.

There are two ways to play. Classic goes on for as long as you can keep the board alive. Daily is a short, fixed round that everyone plays with the same pieces on the same day, with a score to beat.

Your game is saved after every move, so you can close the page and pick up where you stopped.

How to play

Drag a piece from the tray onto the board. While you hold it, the piece floats above your finger so you can see where it will land, and a ghost snaps to the nearest square where it fits. If that spot would complete a row or column, those lines glow in advance, so you see the result before you let go. You can also tap a piece to select it and then tap the square you want. On a keyboard, press 1, 2 or 3 to pick a piece, move it with the arrow keys and press Enter to place it. U undoes and R starts again.

When all three pieces are down, a new tray of three arrives.

Scoring has four parts. Every square you place scores points. Every line you clear scores more, and clearing several lines with one piece is worth far more than clearing them one by one, so a double, a triple and bigger combos each get a name on screen. If you clear again within three pieces of your last clear, you build a streak, and the streak multiplies your line points. The multiplier grows with each clearing turn in a row, up to a limit. Wipe the whole board and you earn a large bonus. A small "+points" figure floats up each time you score.

In Daily you play fifteen rounds of three pieces and your final score is compared with that day's target. Finish it and the day is done; a new challenge arrives the next day.

You get one free undo in each game.

Tips

• Keep the board open. Gaps scattered everywhere hurt more than one untidy corner, because awkward pieces need room to land.
• Look at all three pieces before you place any. The order often matters, and the second piece may finish the line the first one set up.
• Leave a row or column one piece short and wait for the shape that completes it, instead of filling lines cell by cell.
• If a double or triple is one move away, it is often worth waiting, as long as the other pieces still have somewhere to go.
• Protect your streak. If you cannot clear this turn, place a piece so that a clear is ready next turn.

Questions people ask

Is it free? Yes. You can play in your browser without signing up.

Can I rotate the pieces? No. Each piece keeps the orientation it arrives in, so the puzzle is about where you put it.

Do the pieces fit the board? In Classic, the pieces for the first ten trays are picked so that all three can be placed together on the board you have. After that the pieces get larger and the board less forgiving, and when the board is at least half full the game favours pieces that still fit. Daily trays are the same for everyone, so they do not adapt to your board and the game can end before the last round. In both modes the game ends when nothing fits, and that is part of the challenge.

Is the Daily the same for everyone? Yes. Everyone who plays on the same date gets the same pieces in the same order. Its target is set below the score of a simple automatic player on that very sequence, so it can be reached.

Where are my scores kept? On your device. The statistics screen shows games played, best score, average score and best combo.

Does it work on a phone? Yes. It adapts to portrait and landscape, tablets and desktop screens, and you can play with touch, mouse or keyboard.

Is there sound and vibration? There is synthesized sound, which you can switch off with the sound button, and vibration on devices that support it. If your device asks for reduced motion, the effects become simple fades.