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Chapter 3 of 4

Disney Illusion Island: The Tome of Astronomy walkthrough

The second tome opens Crescent Hamlet and the Mail Railz, the trail runs through the PostOfficer's office, and a flooded chute leads down to the last thief.

  • About 97–101 min in the videos
  • 5 parts · 10 steps
  • 1 boss

Steps from 13 text guides, 2 videos to watch · checked Oct 19, 2026

0 of 5 done
Video: BeardBear on YouTube. Loads from youtube-nocookie.com only when you press play.

What each player can do here

P1 · Player 1
  • All four heroes move the same way; only their animations and sounds differ, so pick whoever you like.
P2 · Players 2–4
  • Team moves only work with a partner: leapfrog over each other for a longer jump, drop a rope from a ledge for the other to climb, and hug to add a heart for both of you (Gamereactor calls that heart temporary).

If your skill levels differ: No seat is harder than another. Each player sets their own starting hearts, so a newer player can take three (or the infinite-health setting) while the other takes fewer.Our suggestionThe surer player goes up first and drops a rope, and you hug whenever one of you is low. How to split the roles

Balance of Power

Part 1 of 5. Restart the Mail Railz in Crescent Hamlet.

  1. BothTeleport to the Research Station and use the Tome of Botany on the bookcase to the right: the overgrowth opens the way to Crescent Hamlet.single source
  2. BothRestart the Mail Railz generator for Uncle Steve.single source

First Class Enquiry

Part 2 of 5. Ask the PostOfficer about the last book.

  1. BothUncle Steve suggests asking the PostOfficer about the third book. Ride the Mail Rail into MOPs and find the office.single source

Incorrectly Routed

Part 3 of 5. Reach the Chute Room.

  1. BothBells in Gizmopolis and MOPs reshuffle the corridors. If something shown on the map is nowhere to be seen, ring the bell.single source
  2. BothOpen the way to the Chute Room and hit the emergency button.

Into the Sky Below

Part 4 of 5. Dive to the bottom of the flooded chute.

  1. BothMoon Juice floods the Chute Room and Mazzy brings the last gadget, Deep Dive: swim under Moon Juice and ram the things that block your way. TheGamer files it under Incorrectly Routed; IGN has it at the start of this quest.
  2. BothSwim down through the Shallows, the Depths and the Abyss, ramming underwater platforms as you go.single source

Thief #3 (boss)

Part 5 of 5. Ram every glowing target while the beams turn.

  1. BothSwim through the pools of Moon Juice and ram every glowing target; each full set hits Old Timer.
  2. BothSwim the same way the cross of beams is turning, and change position during the pause before it reverses.
  3. BothGoofy takes the Tome of Astronomy, and the chute it was blocking sucks all four of you away.single source

Boss

Old Timer (Thief #3)The third tome thief

  1. Phase 1: Two pools of Moon Juice with targets inside, and an X of beams that turns one way, then the other. Spikes are added each round.
  2. Phase 2: The pools are rebuilt as mirror images of each other, with more spikes after every round.
  3. Phase 3: A bigger arena with more pools and star platforms. The beams no longer follow one pattern: freeze while he charges, move when he stops.
  • Dying in a boss fight sends you back to the start of the current phase, not the whole fight.
  • The star bridges between pools are the safest way across once spikes fill the middle.
Sources (15)

Steps compiled from 13 text guides, checked Oct 19, 2026, and written in our own words. The videos are there to watch each part; they are not counted as sources for the steps. We did not play the game for this guide. A step marked “single source” rests on one guide so far.