Probably, no brain games at all boost IQ in healthy people. But some of them definitely help with memory, focus, etc, and I agree that those seem to be the hard

Probably, no brain games at all boost IQ in healthy people. But some of them definitely help with memory, focus, etc, and I agree that those seem to be the hard ones. Dual n-back, the general benchmark for these things, is hard. It's exhausting like intricate coding or a tough math proof is exhausting. Certainly I'd be suspicious of anything claiming to do better than that with less mental effort.