Big Walk Black Tower, Black Key and Wall Guide
Understand the late-game handoff from the colored transport towers to the Black key, the wall and Big Walk’s first ending route.
When should you go to Black Tower?
Treat Black as late progression. The Map Room and the chairlift, tunnels and train are not merely collectibles: together they make the island manageable enough to clean up missing rewards and reach the Black route with the group intact.
Progression checkpoints
- Finish the Black Tower sequence and recover the Black key.
- Carry that key to the wall rather than starting unrelated cleanup.
- Open the wall and pass beyond it to unlock Big Wall.
- Continue toward the distant Black Sphere.
- Complete the final cooperative sequence to reach the first ending and Big Goodbye.
Is that the complete ending?
No. After the first credits, unfinished challenges and seven purple post-game challenges lead to the 100% route and Big Game. Continue with the ending and 100% guide when spoilers no longer matter.
Before committing to the final route
Regroup at a known landmark, give the Black key to one named carrier and make sure nobody is still travelling from another tower. Bring light and long-distance communication tools rather than filling every slot with spare puzzle props.
After the wall opens, continue as one party until each player sees their relevant achievement notification. If somebody disconnects, reload from the original host and inspect the wall state before repeating the whole Black Tower sequence.
Sources checked
- Big Walk walkthrough and route hub — Black Tower, wall and ending handoff
- GAMES.GG full ending guide — first and complete ending requirements