Static RetroWeb lab adapted from the Rain Problem predictor: falling particles, deterministic slider-controlled target motion, obstacles, wind, LFO automation, scoring, exports, and diagnostics.
Playfield
Classic Lab0 FPSRisk: lowSeed: localScale: small
Rain Collision Lab
Adjust the sliders. Red drops are predicted to hit the deterministic moving rectangle; green drops are predicted safe. Change wind, target speed, target start, obstacles, and prediction mode to see when the predictor succeeds or fails.
Classic Lab: slow down and observe the prediction math.
Arcade: watch difficulty ramp while the rectangle still follows slider-controlled motion.
Guided: compare one variable at a time and explain false positives/negatives.