Digimon Cyber Sleuth Guide: Chapters, Length & Memory

Ten years after release, Digimon Cyber Sleuth remains the game most fans recommend first — and with the Complete Edition on Switch and PC (plus Time Stranger reviving the series), new players keep arriving with the same questions.

Chapters, playtime, that annoying Party Memory cap, and which game to start with — all answered here.

How Many Chapters in Digimon Cyber Sleuth?

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Digimon Story: Cyber Sleuth has 20 chapters. The pacing breaks down roughly as:

• Chapters 1-7: Setup — the EDEN mystery, becoming a cyber sleuth, building your first real team.
• Chapters 8-14: The mid-game escalation, where ABI and Mega requirements start mattering (our ABI & CAM guide becomes essential here).
• Chapters 15-20: The endgame — including the toughest optional cases and boss rushes.

How Many Chapters in Hacker's Memory?

Hacker's Memory also runs 20 chapters, telling a parallel story on the other side of Cyber Sleuth's events with a new protagonist, Keisuke.

How Long Is Digimon Cyber Sleuth?

How long to beat Digimon Cyber Sleuth depends on your style:

• Main story: ~40-50 hours
• Story + side cases: ~55-65 hours
• Completionist (all Digimon, all cases, platinum): 80-100+ hours

Hacker's Memory clocks in similarly. The Complete Edition bundle is therefore a genuine 100-150 hour package — for current pricing check Steam, where it discounts heavily and often.

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Should I Play Cyber Sleuth or Hacker's Memory First?

Play Cyber Sleuth first. Here's why:

• Hacker's Memory is a parallel side-story — it runs alongside Cyber Sleuth's timeline and its best moments land hardest when you recognize events from the original's perspective.
• Cyber Sleuth introduces the systems (scanning, DigiFarm, Digivolution loops) at a gentler pace.
• Mechanically they're near-identical, so nothing is "outdated" by playing in order.

And no — you don't need either before Time Stranger, which is fully standalone.

How to Increase Party Memory in Cyber Sleuth

The infamous wall: Party Memory starts at just 20, and every Digimon costs memory points that rise as it Digivolves — once your team's combined memory exceeds the cap, you can't add members or even Digivolve current ones.

How to get more Party Memory:

• Memory UP (+5) and Memory UP DX (+10) items are the ONLY way to raise the cap.
• They come from three sources: major boss fights (typically one per serious boss), case rewards, and hidden chests.
• The maximum Party Memory is 255, allowing up to 11 party Digimon within the limit.
• Critical detail everyone misses: Memory UPs must be manually used from your inventory as consumables — many players stockpile them unknowingly while stuck at 20. Check your items menu right now.
• Milestone to aim for: at 100 Party Memory you can field a full team of Megas.

Full location lists are on GameFAQs' Memory UP guide.

The Chapter 15 Cases: A Pet Digimon (and More)

Chapter 15 opens some of the game's best optional content — and its most searched case:

"A Pet Digimon" case (Chapter 15): deceptively cute name, genuinely tough fights. Key beats:

• Follow Hackmon into the new area and activate the orb to unlock the whole zone — a Memory UP chest sits just south of the orb.
• The case includes boss fights against BanchoLeomon and Dynasmon, each dropping a Memory UP. That's a Royal Knight as a "pet" case boss — bring a real team.
• Three Memory UPs from one case makes this the single best memory-farming stop in the late game.

"A Life Crisis" is another of the game's side cases players hunt down — like most cases, it's picked up from the case board, and case completion feeds directly into rewards, sleuth rank, and Memory UPs. (Somen: verify the chapter and 1-2 solution steps in-game before publishing and add them here — I couldn't verify specifics from reliable sources, and guessed walkthrough steps would hurt trust.)

Is Digimon Cyber Sleuth Good in 2026?

Yes — it's still the best entry point to Digimon games. The honest scorecard:

• Great: the Digivolution sandbox, 340+ Digimon (Complete Edition), a surprisingly dark and well-written mystery plot, killer soundtrack.
• Aged: repeated dungeon visuals, some padding in the back half, dated character models on big screens.
• Verdict: if the loop of scan → raise → evolve → rebuild sounds fun, it absolutely holds up — and finishing it sets you up perfectly for Time Stranger's evolved versions of the same systems.

Conclusion

The essentials: 20 chapters (both games), 40-50 hours for the story, play Cyber Sleuth before Hacker's Memory, and raise Party Memory by actually using your Memory UP items — cap 255, full Mega team at 100. Ten years on, it's still good, still recommended, and still the smartest first step into Digimon games.