A benchmark in which language models design roller coasters that RollerCoaster Tycoon 2 builds, tests, and rates.
I'll start by loading the coaster tools.
{"max_results":15,"query":"select:new_ride,place_piece,place_pieces,valid_next_pieces,piece_geometry,undo_piece,get_state,finish_and_test,best_result,demolish"}No matching deferred tools found
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{"dir":1}{"deltas":[{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":1,"dx_tiles":0,"d… (7346 chars)
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Now I have all geometry. Let me start building — station, lift hill, drop, and a vertical loop.
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Lift done, top at z224. Now drop and vertical loop.
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Vertical loop needs an up-slope entry. Let me add an up transition first.
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Vertical loop is valid. Placing it.
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Loop placed. Now descending to station height.
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At station height now. Building the return U-turn (heading north to avoid the lake).
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At (62,42) facing west. Now building the return leg with airtime hills, then closing into the station.
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Circuit closed. Let me test it to bank a score.
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The train stalled in the oversized vertical loop (apex z328 above the lift top z224) — it oscillated instead of completing, so no rating. I'll rebuild with corkscrews (shorter, easier to power) and a taller lift. Let me demolish and start fresh.
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Lift + drop placed (top z304, dropped to z128 for speed). Now the double corkscrew.
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Double corkscrew complete (2 inversions), now facing west at (59,43). Building the return leg with an airtime hill and closing into the station.
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Circuit closed. Testing to bank a real score.
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Banked **5.46** excitement (intensity 5.69, no crash). Good safety net. The ride has low airtime (13) and lots of intensity headroom — let me rebuild with more airtime hills on the return leg to push excitement higher.
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Now the enriched return leg with three airtime camelback hills.
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Improved slightly to **5.53** (airtime up to 35). Let me try a more dramatic layout with a properly-powered vertical loop, oriented westward to use open space away from the lake. I'll build empirically and check state as I go.
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Lift up to z320, now facing east at (29,46). I need to fix the y-alignment so the vertical loop closes cleanly into the station. Let me adjust the last turn.
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Now the big drop (z320→z112) and the powered vertical loop closing into the station.
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Circuit closed with a big drop and vertical loop. Testing.
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5.53 is safely banked (original, similarity 0.375, intensity headroom). I have time for one more attempt — the airtime clearly helped, so let me rebuild the reliable corkscrew design with bigger airtime hills.
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Now the return leg with two larger airtime hills.
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That scored 5.46 — the three-smaller-hills version (5.53) remains best and is safely banked in `best_result`. I'm out of good time to iterate further, so I'll stop here. **Summary:** My best coaster this round is a steel twister — tall chain lift → steep 60° drop → double corkscrew (inversion) → return leg of three airtime camelback hills → 180° turn back into the station. It scored **excitement 5.53** (intensity 5.89, nausea 2.98, no crash), and is an original design (similarity 0.375, well under the 0.5 penalty threshold). That banked result is my score for the round.