Might be a good idea if the tiles fall down to fill the space left by a word. Otherwise you get deadspots full of horrid letters. This also adds a bit of strategy to pick words at the top or bottom of screen first.
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Thanks, still tweaking it! Better random letter selection might help with the deadspots e.g. a new tile should be a vowel if it's surrounded by consonants. Did you figure out the bonus/orange tiles give you even more points for long words? One strategy is to pick words near bonus tiles to help you get the letters you need for a big scoring word.