- XAdventures in Flesh
- XAlexander the Great
- XAmazing Ben
- XBlack Death (The)
- XBotticelli
- XCollege Board Review
College Board SAT Preparation Series- XConnections
- XDescartes' Delight
- XElectoral College / Primary Fight
- XGalactic Magician
Isaac Newton / Full Graphics Newton- XOdyssey in Time
- XPlato's Cave
- XPythagoras and the Dragon
- XShelby Lyman Chess
- XSuper Star Baseball
- XSword of Zedek (The)
Time Traveler- XWar of the Samurai (The)
