When on the causeway however, successfully jumping from a basalt rock to another basalt rock will grant 2 Agility experience. It is possible to fail these jumps, in which case the player will slip off the causeway and fall into the water, before washing up on the closest shore. Failing to cross between two basalt rocks will still grant the player 0.5 experience, while also inflicting a moderate amount of damage (up to 10, regardless of Hitpoints level).

It is not possible to fail the jump between the centremost basalt rocks, but jumping between two of any of the other basalt rocks can be failed, with the same success rate shown below shared between them.^{[1]}

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