| Montanha Russa: | Demon (1980 to ?) Turn Of The Century (5/29/1976 to 1979) |
| Parque de Diversões: | Six Flags Great America (Gurnee, Illinois, USA) |
| Classification: | Montanha Russa |
| Tipo: | Aço - Sentada |
| Situação: | Operating since 5/29/1976 |
| Make / Modelo: | Arrow Dynamics / All Models / Custom Looping Coaster |
| Maps: | Bing Maps (Satellite) · Google Maps (Satellite) |
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| Extensão: | 649.2 m | |
| Altura: | 31.6 m | |
| Queda: | 27.4 m | |
| Inversões: | 4 | |
| Velocidade: | 80.5 km/h | |
| Duration: | 1:45 | |
| Max Vertical Angle: | 54 Graus | |
| Elements: | 21.3 m tall Loop 16.8 m tall Loop 10.7 m tall Double Corkscrew | |
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| Trains: | 3 trains with 6 cars per train. Riders are arranged 2 across in 2 rows for a total of 24 riders per train. |
| Restrictions: | Riders must be 1.07 m or taller to ride. |
| Built by: | Arrow Dynamics |
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| History: | Originally opened in 1976 as the "Turn of the Century" with two corkscrew loops. For the 1980 season the two vertical loops were added, the track was painted black and given the "Demon" theme". |