The letters are already on the board. The hard part is getting them into place.
WordFlip is a word puzzle you play at your own speed. Every letter is on the board from the start, and the only move is to swap two of them that sit side by side. Line a word up in the golden cross and it lifts off, letters falling in behind it.
Swap them into the cross and watch the words fall out. 1,000 levels, six languages.
The letters aren't hiding. They're just in the wrong place.