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48 seeded short loading manifests and crossings. Container weights and deck positions produce port/starboard and fore/aft torque; spring-and-damping buoyancy responds to cargo, stack height, wind and adjustable ballast. Pair equal weights across the deck, then watch two stability needles and a two-second gust forecast. Later manifests add stronger crosswinds, compulsory two-high corner stacks over reserved tank hatches, fore/aft gusts and a central heavy container. Crane moves cool down and lock at unsafe lean; only the top container can be lifted. Stars, best score, unlocked manifests and achieved UTC Daily streaks are saved. Friends compare identical seeded solo barge challenges, not shared physical cargo. This is a deliberately simplified toy hydrostatics model, not a marine simulator.
Tap or pointer drag the deck grid. Keyboard 1–9 selects deck squares; A/D or left/right trims roll, W/S or up/down trims fore/aft, Space launches, Escape pauses/resumes and R resets a solo manifest.
Daily uses the UTC date for one identical seeded manifest; only a won crossing earns a streak, once per date. Friends starts a fresh finite level-25 seeded challenge for each player, compares stability scores and uses the shared Kit podium and Pip computer character. Players do not manipulate each other's cargo.