Hexadec
 
Score0
 
Tap four tiles.

How it goes

Sixteen tiles. Hidden among them are four four-letter words that use every tile exactly. Build one and it lands on the next row down.

2×L double letter 3×L triple letter 2×W double word 3×W triple word

A premium square counts on the turn you cover it, and it counts for the column too. Later words score their own squares, not yours.