A benchmark in which language models design roller coasters that RollerCoaster Tycoon 2 builds, tests, and rates.
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I'll analyze the previous result: 6.36 excitement, 6.56 intensity, 3 inversions, similarity 0.38 (safe). Goal: bank a solid score early, then push for higher excitement with more inversions and a taller drop. Let me get the piece geometry to plan a closed circuit.
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I have the dir-0 geometry. Now I need the geometry for the other three directions to plan my turnarounds and return leg precisely.
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I now have full geometry for all directions. I've planned a complete closed circuit on paper: **Plan "Quad Threat"** — start (58,45) facing -x (dir 0), avoiding the lake: - **Leg A** (y=45): station → 14-piece chain lift to z=352 → 60° triple drop → left loop → right loop - **U-turn** (right turns) → **Leg B** (y=50, +x): corkscrew pair (left-up/right-down), mirrored corkscrew pair (right-up/left-down) = 4 more inversions, 2 airtime hills, 2 more vertical loops (L then R to keep lane) - **U-turn** → **Leg C** (y=45): brakes + flats back to (58,45). Net displacement verified: (0,0), dir 0, slope 0. That's 4 loops + 4 corkscrews = up to 8 inversions. Let me start building — station and lift first.
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Ride created at (58,45). Building the station and 14-piece chain lift.
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Lift complete at z=352. Now the 60° triple drop and the first two vertical loops.
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Drop and two loops done. Now the U-turn (right turns) and the corkscrew section — first the turns, then corkscrews separately to catch any rejection cleanly.
U-turn complete, now heading +x. Placing the two corkscrew pairs (4 inversions).
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Corkscrews accepted — 4 inversions banked in. Now the two airtime hills.
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Hills done. Now loops 3 and 4 (left then right to stay in the y=50 lane).
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All 4 loops placed. Now the return leg: 10 flats, the second U-turn, and the braked final approach into the station.
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**Circuit closed!** Cursor returned to (58,45) exactly as planned. Testing now to bank the score.
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**Score banked: 6.99** (up from last round's 6.36)! But intensity is **10.20** — just over the ~10 threshold that tanks excitement. Similarity 0.33 is safe, and 6 inversions counted. Key diagnosis: my **unbanked** U-turns are taken at high speed → lateral G spiked to 2.91 (last round used banked turns and had 6.56 intensity). Fix: rebuild the identical layout but with **banked** U-turns (flat_to_right_bank + banked_right_turn_5 ×2 + right_bank_to_flat). Same displacement (+1,+5) and (-1,-5), so the circuit closure math is unchanged. Since best_result keeps the 6.99, rebuilding is risk-free.
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Banked U-turn and corkscrews in. Now the hills and final two loops.
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Circuit closed with banked turns. Testing.
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Banked turns barely helped (7.01, intensity 10.18) — so the lateral G comes from the **corkscrews** themselves, not the U-turns. Analysis: last round had 3 inversions → 6.56 intensity; this has 6 → 10.18. Each inversion adds ~1.2. I need to drop ~1 inversion-equivalent to get safely under 10. New plan (v3): remove the **second corkscrew pair** (the highest-lateral element) and replace it with **3 gentle s-bends** that produce the same lane shift (dy-3, dx+9) with minimal intensity. Keeps 5 inversions (4 loops + 1 corkscrew pair), zero stall risk. 7.01 is banked, so this is a free shot at beating it.
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I sent one `up_25` short (z=336, cursor x=39). Fixing: undo the flat top, add the missing chained `up_25`, then re-cap.
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One corkscrew pair + s-bends in. Now hills and the last two loops.
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Circuit closed with the 5-inversion layout. Testing.
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v3 result: intensity dropped to 9.79 but excitement *fell* to 6.83 — the corkscrew pair was worth more excitement (+0.18) than the intensity penalty it caused. So the penalty at 10.18 is gentle, not a cliff. **7.01 remains banked.** Learning: inversions are net-positive even slightly over intensity 10. New experiment (v4): take the 6-inversion v2 layout and add a **third loop pair** after loop 4 (at moderate post-hill speed), replacing 8 of the 10 flats — same cursor math, so closure is preserved. 8 inversions total. Since 7.01 is banked, this is a free moonshot.
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Now the third loop pair, then the banked U-turn and return leg.
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Circuit closed with 8 inversions. Testing.
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8 inversions spiked intensity to **10.94** and excitement got *tanked* to 5.28 — confirming a sharp nonlinear penalty above ~10.5. The sweet spot is clearly 6 inversions at intensity ~10.2 (v2 = 7.01, still banked). Final experiment (v7): keep **6 inversions** but make them all **vertical loops** (0 corkscrews) — loops have a better excitement/intensity ratio than corkscrews (no twisting lateral G). I swap the corkscrew 4-pack for a loop pair with identical net displacement, so closure math is unchanged.
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Circuit closed with 6 loops, 0 corkscrews. Testing.
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**Breakthrough!** v7: excitement 7.01 but intensity crashed to **7.36** (lateral G 1.32 — the corkscrews were the entire lateral/intensity problem). Now I have massive intensity headroom while keeping 6 inversions. Final move (v8): add one **more loop pair** into the long flat section (same dx displacement, closure preserved) → 8 loops total, estimated intensity ~8.2 (safely under 10), excitement should climb well above 7.01.
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Now the 4th loop pair (8 loops total) plus the return leg.
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**New best: 7.06!** (8 loops, intensity 8.18 — safely under 10, similarity 0.36 safe). But the gain was small (+0.05), meaning loops at moderate speed have diminishing returns, and I still have ~2 points of intensity headroom. One more shot (v11): keep the 8-loop skeleton but swap the two gentle 25° hills for **sharp 60° hills** — sharper crests = more airtime (negative-G excitement) and fun positive G, using the intensity headroom I just earned. Same dx per slot, closure preserved.
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**New best: 7.24!** The 60° hills delivered — strong airtime (negative G -2.65) feeds excitement, intensity 8.92 still safe. One final experiment (v12): swap the last loop pair for **two more sharp 60° hills** (6 loops + 4 sharp hills) — if airtime is what's paying, this should push further. 7.24 is banked either way.
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← openrouter_moonshotai_kimi-k3 · 20260728-kimi-k3-design-rerun · all runs