1. Title (Theme of X)
2. Prologue
3. Training
4. Junction Tunnel Scene
5. Briefing Intro
6. Briefing Cutscene
7. Briefing
8. Mission One
9. Encount
10. Game Over
11. Mission Three
12. Mission Clear
13. Intermission
14. Mission Four
15. Dr Yamano
16. Dr Yamano
17. Mission Two, Five
18. Mission Six, Seven, Eight, Nine
19. Mission Ten
20. Mission Ten Clear
21. Debriefing
22. Tunnel Scene
23. Ending
24. Unknown Jingle