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Normal Countdown is the starting point. Higher levels keep six tiles but raise the target range and solution difficulty.
This is a harder Countdown numbers game for players who want generated rounds beyond normal practice.
The bottom difficulty is normal Countdown. Push the slider up for bigger targets and generated rounds that require more arithmetic steps.
The standard Countdown numbers game uses six tiles and a three-digit target. This extreme version keeps the same six-tile board, then ramps up through larger target ranges and generated routes that require more steps.
Higher difficulty levels are designed to produce rounds that are still answerable but need a longer chain of arithmetic. Use them when normal Countdown practice feels too predictable and you want more multi-step routes.
Because the number of tiles stays fixed, the challenge comes from the target and the route rather than from simply having more raw material. That makes the hard levels useful for practising manipulation of large intermediate values, controlled division, and spotting when a promising expression can be redirected towards the target.
There is a short survey about what is useful, confusing, or missing.