Reactordle
Puzzle #3 was Calder Hall.
Calder Hall Nuclear Power Station is a former Magnox nuclear power station on the Sellafield site in Cumbria in North West England. Calder Hall was the first full-scale nuclear power station to enter operation in the West, and was the sister plant to the Chapelcross plant in Scotland. Both were commissioned and originally operated by the United Kingdom Atomic Energy Authority.
Read about it on Wikipedia →
What the record says
Puzzle 3 ran on 18 Jul 2026 and the answer was Calder Hall, played with 6 guesses against 4 columns. On the record: Country - United Kingdom; Status - shutdown. The numbers: Grid connection - 1950s. 1 of the 4 columns is blank in the source (Power band), so nobody could score it either way.
Beyond the grid the record adds First grid connection - 1956.
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
- United Kingdom
- Power band
- Not recorded
- Grid connection
- 1950s
- Status
- shutdown
Also on the record
- First grid connection
- 1956