What Is the Canon Route in Shadow the Hedgehog (2005)?

SEGA has not named one specific six-stage route as the single canon path through Shadow the Hedgehog (2005). The game deliberately supports 326 story sequences and ten normal endings, then unlocks Last Story only after all ten endings have been cleared. What is clearly established later is the final outcome: Shadow defeats Black Doom and moves forward from his past.

Short answer: there is a canon resolution—Last Story and Shadow defeating Black Doom—but no officially identified single pre-Last Story route such as “Pure Hero” or “Pure Dark” that SEGA labels as the one canon route.

What the game itself establishes

Confirmed: Story Mode can branch through 326 possible six-stage sequences. The route changes when a Dark, Normal, or Hero mission sends Shadow to a different next stage.
Confirmed: There are ten normal endings. Clearing all ten is required before Last Story becomes available.
Confirmed: Last Story supplies the final confrontation with Black Doom and the story's concluding outcome.
Not confirmed: SEGA does not identify one numbered Library path, one Pure Hero route, or one Pure Dark route as the unique path that “really happened” before Last Story.

Why fans disagree about the canon route

Each normal route shows Shadow making different choices and reaching different conclusions about himself. Some paths lean strongly Hero, some Dark, and some remain closer to Neutral. Because Last Story is locked behind completion of all ten normal endings, the game treats those endings as pieces of the completion structure rather than selecting one of them as the sole gateway to the finale.

That is why “the canon route” is usually a fan reconstruction. A route can feel more thematically consistent with Shadow's later characterization without being officially designated by SEGA as the canonical six-stage sequence.

Is the Pure Hero route canon?

It is a valid route, but SEGA does not label it as the one canon route. Later official chronology describes Shadow ultimately defeating Black Doom and overcoming the conflict surrounding his past. That final heroic outcome lines up with Last Story, but it does not retroactively name one particular Hero-leaning path through the first six stages as the only path that counts.

Are all 326 routes canon?

The safest answer is: the 326 routes are all valid playable story sequences, but “canon” is not the same thing as “playable.” The game records them in its Library, while later SEGA material summarizes the lasting story outcome rather than treating every contradictory ending as simultaneously literal history.

Shadorux separates confirmed canon from route interpretation. When SEGA has not named a unique path, this page says so instead of promoting a fan theory as fact.

What later official material confirms

SEGA's Sonic Channel world chronology states that Black Doom invades Earth, Shadow searches for the Chaos Emeralds while sometimes clashing with Sonic and the others, and after his internal conflict he defeats Black Doom, fulfills the feelings entrusted to him, and decides to move forward beyond his past. Shadow Generations later treats Black Doom as an enemy Shadow had already defeated.

Sources

SEGA Sonic Channel — Sonic World Story for the official chronology of Project Shadow, the Black Arms invasion, and Shadow defeating Black Doom.
SEGA Sonic Channel — Shadow the Hedgehog for the official 2005 game premise.
SEGA — Sonic × Shadow Generations character profiles for Shadow and Black Doom's later official status.
StrategyWiki — Shadow the Hedgehog for the documented branching level structure used to cross-check the route graph.

Continue through the Shadow 2005 tools cluster

See the minimum-clear plan for all ten endings, inspect every transition on the stage map, or build a valid path in the 326 Route Explorer.