Execution

In Multi-Blind the competitor names the number of cubes beforehand, at least two (H1a), memorises all of them, then solves them all blindfolded. The time limit is ten minutes per cube for fewer than six cubes, and an hour otherwise (H1b). The result is the number solved minus the number unsolved; below zero, or with only one cube solved, the attempt counts as unsolved (9f12c).

Multi-Blind memorisation leans on long-term memory: each cube gets its own route or part of a route, solvers review earlier cubes as they go, and execution recalls one cube at a time. Choosing how many cubes to attempt balances the time limit against the risk of forgetting.