The retrieved literature consistently confirms the existence and use of a 64-card version of the Wisconsin Card Sorting Test (WCST-64) that utilizes a single deck of cards.
The retrieved papers repeatedly discuss the Wisconsin Card Sorting Test 64-card version (WCST-64), explicitly noting that it utilizes a single deck of 64 cards as a shortened alternative to the standard 128-card version. There are no papers contradicting this factual description.