Reactordle
Puzzle #109 was R4 nuclear reactor.
R4 nuclear reactor was a nuclear reactor built at Marviken, Vikbolandet and the fourth nuclear reactor built in Sweden. It was heavy water moderated and intended for the dual role of 130Â MWe of power generation as well as plutonium production. It had a central role in the Swedish nuclear weapon programme.
Read about it on Wikipedia →
What the record says
Puzzle 109 ran on 1 Nov 2026 and the answer was R4 nuclear reactor, played with 6 guesses against 4 columns. On the record: Country - Sweden; Power band - <500 MW. 2 of the 4 columns are blank in the source (Grid connection and Status), so nobody could score them either way.
Beyond the grid the record adds Nominal power - 132 MW (<500 MW).
Reactordle builds its record from Wikidata - CC0 1.0. The description above comes from the same place the game credits on every reveal: English Wikipedia verbatim extract plus sourced facts, CC BY-SA 4.0. The puzzle itself is still playable in the archive, and every answer that has been and gone is listed on the past-answers page.
How it scored
- Country
- Sweden
- Power band
- <500 MW
- Grid connection
- Not recorded
- Status
- Not recorded
Also on the record
- Nominal power
- 132 MW (<500 MW)