The town of Te Kuiti is 1hr south of Hamilton on State Highway 3. From Te Kuiti, head south on State Highway 30 (by the large statue of a sheep shearer) towards Taupo for 2km. After cresting the first big hill, the turn-off is located on the left-hand side and is sign posted "Mangaokewa Scenic Reserve" with both a large wooden sign and a small yellow sign on the opposite side of the road. If you are coming up highway 30 from the direction of Taupo, do not be confused and drive down Mangaokewa Road as that this does not lead to the cliff at all.
After turning into the reserve, drive down the hill to the carpark/camping area. The best access to the crag is by crossing the swing bridge and following the track to the right. Within 5 meters, there is a smaller track which cuts left up the hill. Take this left for only a few meters until a "climber track" appears on the right (marked with two piles of stones). This track treads up the hill diagonally to the right and will bring you directly up to the Colosseum.