To play a traditional Scrabble-type game, disable flex turns and tile taking.
If you're playing with limited flex turns, wait until the board has enough tiles to make a flex turn worthwhile, especially if bonus squares are within reach.
When making a flex turn, be careful when moving played letters that are on a letter bonus square, as these may cost more.
When flex turns are always available, prefer making a flex turn to tile swapping or turn passing.
If you can't play a loosened tile during a flex turn, take it into your tray (if possible).
If you play well without blank tiles, move blank tiles off the board and into your tray to deny them to your opponent.
To make flex turns difficult, play words that cannot easily be split or trimmed.
When double-tapping to zoom in and out of the match board, avoid tapping on tiles.