An interactive, WebGPU-accelerated simulation of Large-Scale Structure (LSS) evolution. The software utilizes a "2.5D" Universe approach, projecting a thin slice of a 3D universe onto a 2D plane, to visualize the formation of cosmic filaments and voids from z = 10 to the present via a live web interface. It combines analytical 2LPT with a local quasi-N-body gravity scheme, incorporating rigorous background expansion and structure growth for LCDM and w0-wa dark energy models. To maintain smooth interactivity with up to 200k tracers, particle interactions are computed locally and include a phenomenological adhesion model. The tool features two distinct modes: a cosmological sandbox with realistic initial conditions and an "enhanced BAO" mode designed to highlight the emergence of Baryon Acoustic Oscillation signals. Optimized for high-performance browser rendering (WebGL/WebGPU), it is designed for professional scientific presentations, classroom teaching, and public outreach.