About Block Collapse
Block Collapse is a tile-clearing puzzle from a family that goes back to the 1980s. The board is eight columns wide and ten rows high, filled with blocks in four colours. Each colour has its own shape as well, so you can tell them apart at a glance.
How it works
Blocks are joined if they share a side. Tap any group of two or more and it vanishes. Everything above drops, and when a column empties completely the columns to its right slide over to close the gap.
The scoring is what makes it a puzzle. Two blocks score 2 points. Five score 20. Ten score 90. A group of fifteen scores 210. Clearing the same blocks in several small taps is worth a fraction of clearing them in one.
Solving tips
Do not tap the biggest group you can see. Look for a colour that has several medium groups separated by a few blocks of other colours, and remove those separating blocks first. When they go, the groups fall together into one large one.
Work from the top where you can. Removing blocks high in a column disturbs very little. Removing blocks at the bottom shifts everything above, which can either join groups or break them apart.
Pick a main colour early and avoid tapping it. Clear the other three around it and let it pile up, then take it in one enormous tap near the end.
Watch for single blocks with no partner. They are what is left at the end, and each one counts against you. Before removing a pair, check that you are not leaving a matching third block stranded.
Rounds take three or four minutes, and the score gives you something to beat, which is what the best HTML5 games do.