Vocabulary Cards from "Word Surfing"

Hi, I´ve recently designed some "Word Surfing" Vocabulary Cards - and the idea is now available at "English Specialist" (thanks to George)

http://english.specialist.hu/wordsurfing/cards/

The concept gives learners an opportunity to actively develop their vocabulary (and grammar) skills in a “game” which encourages good language learning habits. This “game” involves a dynamic framework that produces virtually random testing of graded vocabulary and grammar items. It challenges learners to use what they choose – and demonstrates their progress over time through a motivating scoring system.

The rationale behind the "game" is also given at the above link - and any feedback on the concept would be very much appreciated.

Many thanks

Will