Theta and Paralldoxs on Worldlines Guide
Theta and Paralldoxs on Worldlines — Chapter 3 — Observation Hints
Level hint tables — Chapter 3 — Observation Hints
Last updated: October 19, 2026
Quick Answer
Box-packing, ghost Theta, prisms, overlay — 3-A through 3-38.
Chapter 3 — Observation Hints
Hub: main guide.
Chapter 3 — Observation (1/2)
A level with many box-based gimmicks.
| ID | Level | Revelation | Hints |
|---|---|---|---|
| 3-1 | [Questions] | If boxes are pushed into the same empty cell at the same time from different directions, they end up stacked (overlaid). | |
| 3-2 | Dark Clouds | You can't see outside in the dark. | |
| 3-3 | Illumination | The square pyramid prism emits an optical path in all directions by placing it on the goal. This light can extinguish the darkness | |
| 3-4 | Divergence | A goal is activated when the theta rises above all optical paths exiting the prism. | |
| 3-5 | routine (an)/ | By blocking the periphery of the prism with a box or the like, it is possible to block the occurrence of the optical path. | |
| 3-6 | convergent/ | Prisms allow one theta to fulfill two goal requirements. | |
| 3-7 | Bond | If the theta stands where the optical paths intersect, it is considered to have stood above both optical paths. | |
| 3-8 | JPY | There are 4 optical paths for 2 theta and 1 box, and the box is missing. Let's take advantage of the skirmish. | |
| 3-9 | Chain | The lock blocks the optical path out of the prism. Use the collision to open the lock so that you can activate one goal on one world line. | |
| 3-10 | Net | It is similar to 3-8 but there is no box. Let's use the wall. | |
| 3-11 | Closed Loop | If a box and Theta enter the same empty cell at the same time, Theta enters the box. Box-packing Theta in this state cannot move, but you can still place them on a goal. | |
| 3-12 | rectifier/rectify (vs)/ | When box-packing Theta into a box, an even distance (2 cells) between Thetas allows packing. | |
| 3-13 | Connection | With two boxes side by side, you can box-pack if the distance between Thetas is odd (3 cells). | |
| 3-14 | Reversal | Theta cannot be placed in the goal when packed into the box on the left. Use the motion in the opposite direction to make the box with the box on the right. | |
| 3-15 | Spinlock | In order to pack the theta into the box, the interval must be an even number of cells. Use the lock that came out at 1-15 (theta stuck). | |
| 3-16 | U-Lock | Use the lock. Use keys and locks to unlock. | |
| 3-17 | Deadlock | Use a large number of boxes to create a lockable terrain | |
| 3-18 | Unlock | Box-packing Theta can pick up keys and unlock by overlapping a lock. | |
| 3-19 | Picking Rock | Hard. You must push box-packing Theta holding a key into the goal, which requires pulling out the lined-up boxes on the right. Use a switch block as a lock. | |
| 3-20 | Yūrei | When Theta steps on a thorn in the dark, she becomes a ghost instead of vanishing. Theta in this state cannot leave the darkness. | |
| 3-21 | constrain (vs)/ | Ghost Theta can push the box or push it out of the darkness. | |
| 3-22 | Flash | When Ghost Theta enters the Goal or Light Path, her Ghost will be removed and a new World Line will be created where the Ghost Theta disappears. | |
| 3-23 | Refuge | Ghosting must be undone in a safe place. Sharpening the darkness in the light path can limit the range of motion of the Ghost Theta. | |
| 3-24 | Play | The route is divided into left and right. Complete the optical path by setting up the prism on the right root and operating the switch on the left root. | |
| 3-25 | Ambush | Reduce the darkness with the left prism to limit the movement of the Ghost Theta and create a box | |
| 3-26 | Stealth | The goal is to retrieve the key in the upper left with Ghost Theta. Block with a box so as not to shine light on the darkness. Eventually, you will need a box to block the optical path. | |
| 3-27 | Color Dispersion | Utilize 3-cell darkness without spikes to multiply the World Lines. The first move is important. | |
| 3-28 | Protection. | The Ghost Theta can also be packed into boxes and placed outside the darkness. Shining this theta into the light removes the ghosting and generates a world line where theta disappears with each box. | |
| 3-29 | capture, acquire | Lock to make Ghost Crate Theta. Use the middle pillar and box. | |
| 3-30 | Answer | Shining light on stacked boxes generates a new worldline. The top box moves to the new worldline. | |
| 3-31 | Compact | Use the four boxes to create an overlap. In addition to superimposition, collisions are also used. | |
| 3-32 | Polymorphic | Prisms can also be superimposed. When exposed to light, it behaves similarly to a box. | |
| 3-33 | Obstruction | Placing overlaid boxes straight on the goal dead-ends you. Use a collision. | |
| 3-34 | Division | You can overlay three or more boxes; shining light creates one worldline per stacked box. If you box-pack Theta into overlaid boxes and shine light, every worldline’s box gets a Theta inside. | |
| 3-35 | TOWERS | Stack all the boxes using vertical and opposing overlays. | |
| 3-36 | Inheritance | You need to create four world lines and activate the goal at the end of the thorn. Use a box of overlapping optical paths made by prisms. | |
| 3-37 | Fukabori | Use overlay: fill the left three goals with Theta and the four goals beyond the spikes with box-packing Theta. You need four worldlines. | |
| 3-38 | breaking down, disintegration | Simply create 18 world lines. |
Chapter 3 — Observation (2/2)
| ID | Level | Revelation | Hints |
|---|---|---|---|
| 3-A | Elongation | You need box-packing Theta but lack terrain to adjust spacing. Two boxes are enough to box-pack, so use extra boxes as terrain. | |
| 3-B | Extension | Similar to 3-A, but with few usable walls, the number of boxes required to push a boxed theta into the goal is increasing. Since there is one more box from 3-A, create a terrain with two boxes. | |
| 3-C | spread (vs)/ | Creating a boxed theta at the top surrounded by thorns will not put it in the goal. Use the oncoming movement to create the box. | |
| 3-W | Dark Forest | In order to remove the prism from the darkness and place it in the goal, you need to bring light from outside the 3-W. Addition is used because light needs to be connected in one world line. Candidates will be maps with prisms and cracks in the walls. | |
| 3-X | Repulsion: | The counterclockwise level of the icon can be pressed like the box, and it cannot overlap just by moving it. You will enter using the techniques used in this chapter. | |
| 3-Y | There are locks but no keys, and you cannot bring keys via addition (+) or direct product (*). You need a third entry method using 3-X. |
Level overlay (^)
Spoiler — Chapter 3 — Observation (2/2) — Level overlay (^)
A technique that stacks two levels onto one worldline (neither addition nor direct product). Objects at the same coordinates overlap. Happens when box-packing Theta on one level enters another while overlaid. Notation: LevelName1 ^ LevelName2.

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