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Play Theta (Japan edition · Japanese) Online
theta
Play Theta online. Turn connected gears to guide coloured atoms and restore an aquarium.
Browser play

Nintendo DS (NDS) — EmulatorJS controls
Default Player 1 keyboard mapping. Change keys in Controller Settings.
| Console button | Keyboard |
|---|---|
| ↑ / ↓ / ← / → | ↑ / ↓ / ← / → |
| A / B / X / Y | Z / X / A / S |
| L / R | Q / E |
| START / SELECT | Enter / V |
| Microphone | Not assigned |
Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.
How to Play Theta
Quick start
Try an early rotation puzzle, align gear openings and fill coloured holes; then use earned atoms in Aquarium Puzzle.
Controls
Drag the lower gear around with the stylus to rotate it and linked gears. In Aquarium Puzzle guide atoms into the charge field according to the sample pattern.
Theta — About this game
Turn connected gears to guide coloured atoms and restore an aquarium. In theta’s rotation puzzles, spinning the lower gear also moves linked gears; aligning their openings lets atoms fall toward matching coloured holes. Think through the whole chain before a turn, because moving one wheel changes several positions. The atoms earned feed Aquarium Puzzle, where the stylus guides floating atoms into a charge field to match a sample molecule. Leave a completed molecule to supply the tank, then visit My Aquarium and the fish album to see what your progress has added.
Theta Game manuals
Cheats
No cheats have been added for this edition.
Player verification and sources
Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.
- Browser test and catalogue publication date
- Browsers and devices
- PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
- Player engine and core
- EmulatorJS 4.3.0-pre · nds
- Tested by
- rwEmulator
Sources and editorial basis
rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.