Spark one copper node and light every lamp without hitting a keg
Caliente
An old generator yard, a scatter of copper nodes, and a single decision. You tap one node, and a lime arc leaps from it to the nearest untouched node, then onward to the next nearest, and the next, hopping through the yard on its own until its links run out. Your whole move is the choice of where that first spark begins.
That makes this a puzzle of consequence rather than reflex. The cascade follows one simple law — always jump to the nearest node that has not yet been touched — so every board has exactly one right answer hiding inside it, and finding it means tracing the chain in your head before you commit. Seed from the edge and the arc may strand itself in a corner. Seed from the middle and it may double back, wasting links on nodes it has already lit. The goal is a seed that leaves no lamp dark.
There is a second thing in the yard, and it is less forgiving. Powder kegs sit among the nodes, and the arc does not know to avoid them. If your cascade comes within reach of one, the run ends there. So you are not only planning a route that reaches everything — you are planning one that keeps its distance, reading the gaps between a node and the keg beside it, and deciding whether the chain will swerve past or walk straight into it.
Caliente
Twenty-five levels tighten the screws one turn at a time. Boards grow denser, so nearest-neighbour hops become harder to predict at a glance. Kegs creep closer to the copper, narrowing the safe paths until a single misread distance costs the level. Chains get shorter, which means fewer links to cover the same number of lamps and no room at all for a detour. And then the nodes begin to drift, slowly, so the map you worked out a moment ago is not quite the map in front of you when you tap.
The pleasure here is the quiet kind: a dim yard, a few seconds of looking, a tap, and then a lime line stitching itself from node to node while you watch to see whether you read it correctly. When the last lamp catches and the arc dies with its links spent, the board sits there fully lit and the answer looks obvious in hindsight — which is the whole trick of a good puzzle.
Caliente
It asks for patience and a little spatial arithmetic rather than quick fingers. One tap per attempt, instant retries, and a board you can study for as long as you like. Suitable for anyone who enjoys chain reactions, cascade logic, and the small satisfaction of finding the one node that sets everything else alight.