Quadrilla

High-score chaser game made for a jam.

You can only dig a tetromino out of the incoming blocks, and have to place it down to make a line. You must place the tetronimo near other blocks or the walls. Blocks of different types will not link. Groups of blocks not supported by the sides or by other blocks below will fall.

Purple blocks only clear lines with other purple blocks, and black blocks can't be picked up. Chain blocks can only be cleared by executing a chain on them (blocks have to fall in the gap and clear the line).

Combo system

If you want big numbers, this is the score calculation, probably subject to change :

Base line value : 10
Pure line value : 20
A pure line is a line made of blocks of the same type.

Combo Bonus : if you keep clearing lines less than 10 seconds part, the bonus goes up by 1 for every clear.

Chain Bonus : if a block falls and clears a line, chain bonus goes up by 2. It keeps increasing by 2 for each additional fall clear resulting from the initial one.

Multi Bonus : if you clear multiple lines at once, for a maximum of four (1x 3x 5x 8x).

Final score = sum of line values * multiple lines bonus * combo bonus * chain bonus 

Sometimes you'll get a "chain!" notification without doing a chain but it's a bug.