Dual stream

Type the targets top to bottom; the cursor marks the next one (␣ = space, between the hands). Each mistake cancels a hit. N = 23 · 4.46 bits per hit

Practice (unscored, any length)

Wrong press:

Include space (␣)Drop hard-reach letters (q z p x)Include upper case (A–Z, with Shift)

Group size:

Sound

Pacer:

A 3-second countdown precedes the run. B = log2(N − 1) × max(Sc − Si, 0) / t, updated live.