single-digit multiplication, timed. see your answers per minute and accuracy across 30-second levels — then a gentle look at how that compares to a 1990 TI-81 and an RTX 3090.
every problem is two single digits, 1–9. type the answer — it submits itself the moment you've typed enough digits, no enter key needed. a level ends after your chosen time; keep going for as many levels as you like.
both numbers are back-of-envelope engineering estimates, not lab benchmarks run against this exact test — the TI-81's from its clock speed and lack of hardware multiply, the 3090's from its published FP32 throughput. treat them as "roughly this many times," not a scoreboard.