Pop It
Word bubbles float up. Pop the one that matches the meaning.
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How to play
A meaning stays at the top while four word bubbles drift up at different speeds. Pop the bubble with the matching word, by clicking or with the keys 1 to 4. A wrong pop counts the word as missed, and if the right bubble floats away, the answer is shown.
What it trains
Telling close words apart and linking a meaning to the right written form.