Mouse: Use the mouse to click letters you want to select, to delete from the word you are spelling just click on the word and the last letter will be removed.
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From the page: "These games tend to be quite abstract and typically involve arranging geometric forms to achieve a goal (e.g. Tetris). Puzzles usually involve solving rather simple problems. Problem solving games generally test a players awareness of patterns and/ or short term memory. Reaction speeds are not usually put to the test with the emphasis being more on solving a puzzle presented on the screen. However as games have evolved they have taken on more challenging elements and now a lot of puzzle games do introduce a time limit to increase appeal, sustain gaming interest and increase the challenge. Language generated tends to be isolated to individual language items such as object vocabulary and instructions."