Etymologic!

Billing itself as "the _toughest_ word game on the web", this quiz provides a player with ten English word-origin questions, each offering four semi-plausible radio-button answers to be clicked upon, only one of which is correct. If a wrong answer is selected, the correct one is indicated, and after ten questions have been asked the player's final score is tallied and, in a striking referral-revenue model, the player is invited to take the developers up on the purchase of a recommended etymology book through Amazon.com -- a sharp contrast to the suspiciously gushing altruism of the similar FreeRice game. The administrators also take submissions of further etymological questions to trip up future players.