Word Decoder is a good way to practice vocabulary for standardized tests, including the ACT, SAT, GRE, TOEFL, and more. The lists are community-contributed and are free to download. The game offers two play modes: one, decoder mode where a player unscrambles the letters using the definition as a guide as to what the word is, and two, quiz mode where a player chooses the word's definition from four possibilities. Both gaming modes track game progress, including incorrect, correct, and skipped words.