Escape from Tenopia
1. Tenopia Island (1986)

Earth Inspectors
6. Africa: Where Do Elephants Live Underground? (1989)
12. Russia: What Is the Golden Horde? (1990)
America: Why Is There an Eye On a Pyramid On the One Dollar Bill? (1988)
Olympus: What Is the Secret of the Oracle? (1988)

Choose Your Own Adventure
1. The Cave of Time (1979)
5. The Mystery of Chimney Rock (1980)
     aka The Curse of the Haunted Mansion
6. Your Code Name Is Jonah (1980)
     aka Spy Trap
7. The Third Planet from Altair (1989)
     aka Message from Space / Exploration Infinity
8. Deadwood City (1978)
9. Who Killed Harlowe Thrombey (1981)
12. Inside UFO 54-40 (1982)
14. The Forbidden Castle (1982)
16. Survival at Sea (1982)
18. Underground Kingdom (1983)
21. Hyperspace (1983)
28. Mountain Survival (1982)
39. Supercomputer (1984)
45. You Are a Shark (1985)
50. Return to the Cave of Time (1985)
52. Ghost Hunter (1985)
62. Sugarcane Island (1986)
71. Space Vampire (1987)
80. The Perfect Planet (1988)
84. You Are a Monster (1988)
91. You Are a Superstar (1989)
95. You Are a Genius (1989)
97. Through the Black Hole (1990)
100. The Worst Day of Your Life (1990)
110. Invaders from Within (1991)
112. Skateboard Champion (1991)
116. Kidnapped (1991)
118. Vampire Invaders (1991)
122. Magic Master (1992)
124. Superbike (1992)
128. Viking Raiders (1992)
132. The Luckiest Day of Your Life (1993)
134. Secret of the Dolphins (1993)
136. Roller Star (1993)
138. Dinosaur Island (1993)
140. Horror House (1993)
142. The Reality Machine (1994)
144. Comet Crash (1994)
146. Soccer Star (1994)
150. Who Are You? (1994)
152. War with the Mutant Spider Ants (1994)
154. Cyberspace Warrior (1994)
156. You Are an Alien (1995)
158. Sky-Jam! (1994)
160. The Computer Takeover (1994)
162. Typhoon! (1995)
164. Fright Night (1995)
168. Hostage! (1996)
170. Greed, Guns, and Gold (1996)
172. Mountain Biker (1996)
174. The Power Dome (1996)
181. Fire on Ice (1998)
182. Fugitive (1998)
184. Mayday (1998)

Skylark Choose Your Own Adventure
1. Circus (1981) (with R A Montgomery)
3. The Sunken Treasure (1982)
5. Gorga, the Space Monster (1982)
7. Help! You're Shrinking (1983)
9. Dream Trips (1983)
13. Jungle Safari (1982)
23. The Polar Bear Express (1984)
40. The Great Easter Bunny Adventure (1987)
46. A Day with the Dinosaurs (1988)

Choose Your Own Super Adventure
1. Journey to the Year 3000 (1987)

Space Hawks
1. Faster Than Light (1991)
2. Alien Invaders (1991)
3. Space Fortress (1991)
4. The Comet Masters (1991)
5. The Fiber People (1991)
6. The Planet Eater (1992)

Choose Your Own Nightmare
1. Night of the Werewolf (1995)
7. Biting for Blood (1996)
13. The Haunted Baby (1997)