21-Two One- Dreamcast box art

Sega Dreamcast · Adventure

21-Two One-

Deep cut

SystemSega Dreamcast
GenreAdventure
Players1 player
CommitmentWeekend project (Roughly 6–20 hours)
LegacyDeep cut · legacy score 4

21-Two One- arrived on the Sega Dreamcast as an adventure game.

Among the 38 Dreamcast adventure games in our database, it ranks #7 by legacy score.

This is a solo experience: one player, no waiting on anyone else.

Pick it if…

  • you want to get lost in a long quest
  • you have time for a weekend project (roughly 6–20 hours)
  • you've played the Dreamcast hits and want something less obvious

Maybe skip it if…

  • you want fast action rather than puzzles and exploration
  • you are looking for something to play with friends

What playing 21-Two One- is like

Adventure games focus on exploration, story and puzzle-solving rather than combat. Progress comes from examining your surroundings, collecting items and figuring out how they fit together.

Tip for newcomers: Classic adventure games can be cryptic by modern standards. Take notes, try everything on everything, and save before risky choices.

21-Two One- gameplay screenshot on Dreamcast
In-game screenshot (Dreamcast)

21-Two One- walkthroughs & guides

Stuck, or want to go deeper? These trusted sites have full walkthroughs, completion times and more for 21-Two One-.

If you like 21-Two One-, the Matrix also picks…

Kanon box art
Kanon Dreamcast · Adventure Classic
Air box art
Air Dreamcast · Adventure Classic
Riven box art
Riven PS1 · 1997 · Adventure Classic
Snow box art
Snow Dreamcast · Adventure Deep cut

Playing Dreamcast games today

Dreamcast games still feel inventive and colorful, and many have been re-released on later platforms. The console also has a remarkably active homebrew scene for a system that left shelves so long ago.

21-Two One- FAQ

Is 21-Two One- multiplayer?

No. 21-Two One- is a single-player game.

How long does 21-Two One- take to play?

As an adventure game, 21-Two One- typically falls into the "Weekend project" category: roughly 6–20 hours. Your time will vary with skill and how much you explore.

Read more about 21-Two One- on Wikipedia. Facts on this page are compiled from the open libretro database and Wikidata; "legacy score" reflects how widely a game is documented across Wikipedia's language editions. Spotted an error? Let us know.

Not sure? Let the Matrix pick for you