Tetradle

Your goal is to move the game pieces to fill the grid with all the pieces and spell out the words. Only, you don't know what the words are yet. It's like a jigsaw puzzle with letter covered tetromino shapes. Some white squares with starting letters are given to you. You need to move the game pieces to cover the gray squares but not the white squares.
The game currently features a daily grid, a random grid, a shareable seeded random grid, and a "survival" mode (survival requires a purchase, and that purchase also removes ads).