Fixes the tiny RollerCoaster Tycoon 3 UI on modern displays — 2× at 4K, ~1.33× at 1440p — with mouse input staying perfectly aligned, plus optional borderless-windowed mode that renders above the game's 1080p cap.
Install: unzip d3d9.dll and d3d9_uiscale.ini next to RCT3.exe (or RCT3plus.exe) and play. The mod self-calibrates on the first launch — no setup, no addresses, no per-version anything.
Confirmed scaling on first launch on:
| Edition | Executable |
|---|---|
| Complete Edition (Steam) | RCT3.exe |
| Platinum / Gold | RCT3plus.exe |
| Original 2004 demo | RCT3.exe |
Other builds (retail, GOG, community-patched) are expected to work identically — discovery is version-agnostic by design. If one doesn't, set Logging=1 under [Debug], relaunch, and open an issue with the log.
Everything the mod patches is validated against the live backbuffer, fully reversible, and cached per-executable — a game update just triggers a fresh 2-second self-calibration.
🤖 Generated with Claude Code