Nucleum

Setup: use the map side and action/contract supplies for player count, with randomized milestones, neutral buildings and the initial Nucleum. Take an experiment, five starting action tiles and resources. The base rules recommend increasing starting available workers from two to three for initial games.

Choose one turn type: play an action tile into your leftmost player-board slot and resolve either or both actions in either order; place a suitable tile with one worker on an empty railway space and resolve color matches; or recharge. On an ordinary player-board tile turn, fulfill one contract before, between or after the actions.

Railways: place adjacent to a city or railway, without needing your own network. Special Directive tiles cannot be railways. Resolve your matched actions before other players resolve theirs clockwise. Filling the line connects it immediately; after actions, claim applicable inauguration rewards and flip the tiles. Map tiles remain there for the game.

Construction networks: a city joins your network through adjacency to your railway, a completed rail line you participate in, or your own building pieces. Count cities for network size; public connectivity alone does not make every city yours. Urban buildings, mines and turbines normally require your network, with a free legal starting location while you have no pieces on the map.

Main actions: Urbanize spends money on urban buildings; Industrialize spends workers on mines or turbines; Develop buys one or two action tiles, with a 2-Thaler surcharge as well as market cost for the second. Contract takes a silver or gold contract and its slot reward. Purple contracts stay public for the first player to fulfill them.

Energize: select a power plant, import coal from a connected coal production area and/or transport uranium from your own mines along any players’ completed rail lines, and meet the demand of one connected, unenergized building of yours or a neutral building. Uranium requires a Nucleum, normally generates 2 electricity each, and is limited by the plant and turbines; pay for using others’ turbines. Take the building reward and achievement tokens equal to demand, then flip it. Excess electricity is lost.

Recharge in order: receive money, workers and VP according to both your used-tile coverage and income-marker positions. Place a milestone marker using your achievement total, at most one per multiplier tier; the zero space grants a bailout but loses 3 final VP. Resolve rewards and any King’s Day scoring, discard all achievement tokens, then recover all tiles from your player-board top.

King’s Day and technologies: the last player to recharge for their first, second and third time triggers the respective scoring. The highest marker earns 6 VP and the second highest 2, with ties handled separately and one player able to score both. Contract or building rewards may unlock a technology of the rewarded level or lower; immediate, ongoing and ultimate-goal technologies have distinct timing.

End and scoring: trigger the end when two of five conditions hold, or three with two players: empty action draw piles, empty silver/gold contract draw stacks, everyone recharged three times, someone unlocked eight technologies, someone reached 70 VP. Finish equal turns, then everyone takes one additional turn. Score milestones, ultimate technology, leftover resources, energized buildings and income-track bonuses. Energized buildings in Praha score double; tied totals share victory.