Saltfire Day 65 3 September 2026
Kiln
How do you make Kiln in 5 merges?
- 1 Breath + Salt Dust
- 2 Dew + Dust Clay
- 3 Ember + Ember Flame
- 4 Clay + Flame Brick
- 5 Brick + Flame Kiln
Why is 5 merges the shortest possible?
Day 65 asked for Kiln — a tier-3 element, one of the made things — and it goes in five merges. Not fewer: par is worked out across the whole recipe tree before the puzzle ships, and then proved by replaying the chain above against the game's own rules, starting from nothing but Salt, Ember, Dew and Breath. If that replay had spent one step more or one step less, the build would have failed and this day would never have run.
Two of the five merges come straight out of the primordials — Dust and Flame — and everything else is built on top of those. The last step is Brick + Flame, which is where Kiln finally condenses.
Now look at Flame: made once, then wanted in two different merges. That is the whole reason the floor is five and not six. A step buys you an element for the rest of the run, so par counts distinct pairs, not branches of a tree — the second time the chain reaches for Flame it is already sitting in the tray, free. Counted as a tree, with a fresh derivation for every single ingredient, this same solution reads as six merges.
Kiln has two recipes in the tree, so the route above is the cheapest way in rather than the only one. Another chain of the same length is quite possible; a longer one is far more likely. One step fuses an element with itself (Ember + Ember). Self-merges are legal moves and a few elements only come out that way — always worth a try when a run stalls.