Mermaid Roller Coaster (LEGO 42703)

About this set

LEGO 42703 Mermaid Coaster sits in the Friends line, and the box labels it as a Friends coaster ride build with a stage and a full track layout. The box shows a part count of 166, while the internal record lists 864 pieces, so treat 166 as the on-box figure and 864 as the overall inventory scale. The color scheme runs through purple, yellow, cyan and green, with jellyfish shaping and undersea coral details carrying the look; the track threads through those elements and gives the scene its amusement-park layering. Difficulty is 3/5. Build the base and coral supports first, then add track sections, pairing the symmetrical jellyfish parts before attaching them, and leave the stage and speakers until the track is closed so you do not crush parts already seated. The minifigures belong to the scene, and following the box layout makes placement easier. It suits builders who have finished smaller sets and want a mid-sized Friends display, especially anyone treating the coaster track as the centerpiece.