Trailmakers: High Seas Expansion is an action, indie, simulation, racing, and adventure game on PC that centers on vehicle construction and open-world exploration in a vast oceanic setting. Players build custom machines using modular blocks and test them against dynamic water conditions on a large new map filled with islands and underwater areas.
Gameplay
The core loop involves assembling vehicles from functional blocks in a builder interface, then piloting them through challenging environments. A revamped physics system governs wind and waves, which directly affect movement, stability, and control of watercraft. Sail blocks and new seating options enable designs such as surfboards, yachts, and tall ships that respond realistically to weather.
Exploration takes place across a massive map that includes both surface and submerged zones. Four distinct islands each contain unique vegetation, animal life, and collectibles, with 35 artifacts per island and over 100 hidden treasures scattered throughout. Secret locations encourage thorough searching above and below the waterline. The weather system introduces variables like storms and currents that test vehicle durability and handling during travel.
New accessory blocks and vanity options allow customization focused on maritime themes, while hull blocks support ship construction. These elements integrate with the existing block-based building to create machines suited for the sea.
Game Modes
The expansion emphasizes sandbox play on the dedicated High Seas map, where players freely build and experiment without resource restrictions. Exploration serves as the primary activity, combining vehicle testing with artifact collection and treasure hunting across the open ocean and islands.
Support for single-player sessions allows solo progression through the environments, while online co-op and PvP options enable shared building and competitive use of the new water physics. The map functions as a self-contained playground that highlights wave and wind interactions in all activities.
Exploration and Discovery
Four islands define the playable space: Coral Cove offers tropical settings ideal for pirate-style vessels, Green Haven features forested wilderness with rocky terrain, Sub-Zero Archaeology Base presents frozen northern landscapes, and Mount Magma delivers volcanic challenges. Each area supports unique building approaches due to differing terrain and weather patterns.
Underwater sections expand the scope beyond surface sailing, requiring vehicles that handle submersion and pressure. Hidden elements reward careful navigation and creative machine designs that adapt to the physics-driven conditions.
Is It Worth Playing?
Player reception stands at mixed reviews, with 66 percent positive ratings from 148 Steam user submissions. The expansion appeals most to those who enjoy water-based vehicle building and environmental challenges over land or air focus.
It provides ongoing value through its large map and physics updates for players who already own the base game and want extended sandbox time. Those seeking new functional blocks for maritime designs will find the most direct benefit, while the mixed feedback often centers on the map feeling less integrated with other content for some builders.
Overall, the title suits builders interested in realistic wave and wind mechanics within an adventure and simulation framework on PC.
