All the odd cubes (5x5, 7x7, etc) aren’t really much more difficult than 3x3. You can learn basically one or two extra algorithms to reduce it to effectively a 3x3 (e.g. for a 5x5 consolidate 3x3 centers and 1x3 edges, then solve exactly like a 3x3). And honestly the consolidation steps are pretty easy to figure out without actual algorithms for the most part.
I never really messed with even cubes (4x4, 6x6, etc) but I’d imagine they scale the same.
All the odd cubes (5x5, 7x7, etc) aren’t really much more difficult than 3x3. You can learn basically one or two extra algorithms to reduce it to effectively a 3x3 (e.g. for a 5x5 consolidate 3x3 centers and 1x3 edges, then solve exactly like a 3x3). And honestly the consolidation steps are pretty easy to figure out without actual algorithms for the most part.
I never really messed with even cubes (4x4, 6x6, etc) but I’d imagine they scale the same.