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| City | Utrecht | Country | The Netherlands |
|---|---|---|---|
| Website | http://www.boulderhalsterk.nl/ |  BoulderhalSterk | |
| Opened | september 7th 2013 | Last visit | february 3rd 2019 |
| Colour | Level | Range | Nr boulders |
|---|---|---|---|
| Dark green | 3 | 3 | Unknown |
| Brown | 4 | 4 / 4+ | Unknown |
| Blue | 4+ | 4 / 5 | Unknown |
| Orange | 5 | 5 / 5+ | Unknown |
| Bright green | 6A | 5+ / 6A | Unknown |
| Pink | 6A+ | 6A / 6B | Unknown |
| Yellow | 6B+ | 6B / 6C | Unknown |
| Purple | 6C+ | 6C / 7A | Unknown |
| Black | 7A+ | 7A / 7B | Unknown |
| White | 7B+ | 7B / 8A | Unknown |
These were the circuits when we last visited this gym. If any of the colours changed or if there is a mistake in this table, send us an e-mail at roos *at* bouldertour.nl. Preferably with a picture of the most recent circuits from this gym.