Must-Hit-By vs. Mystery Progressives: Two Jackpots That Look Identical and Aren't

Walk past a bank of link-style progressive machines and the jackpot displays all look the same: a row of tiered prizes, each with a number ticking upward. What the display does not tell you is which of those numbers is information and which is decoration.

There are two different mechanics behind them, and the difference decides whether sitting down can ever be a play.

The mystery progressive

A mystery, or random, progressive picks its hit point at random. Somewhere in the machine's program a value is drawn for that jackpot, and the prize pays when the pooled amount reaches that hidden draw. You cannot see it, and the number on the glass does not move you closer to it in any way you can read.

This matters more than it sounds. On a mystery progressive, a jackpot that has climbed a long way is not "closer" in any sense you can act on. The draw was made independently of how the counter looks. Waiting for a big number and then sitting down is not patience, it is the same bet at a worse price, because you are paying for a larger display with the same unknown distance still to travel.

The must-hit-by

A must-hit-by works the opposite way: the machine publishes a ceiling. The prize is guaranteed to pay at or before that stated figure, and the machine says so in writing, near the jackpot display or on its help screens.

That published ceiling is the whole reason must-hit-by machines are worth reading. The gap between where the counter stands now and the ceiling it cannot pass is a finite, known distance. It is a quantity you can price. Everything an advantage player does on these machines follows from that one fact.

Telling them apart while you are standing there

Look for explicit wording, "must hit by", "must pay by", "will hit by", printed near the tier itself, not on the overhead sign. If no ceiling is stated anywhere on the machine or in its help screens, treat the jackpot as random and move on.

Read each tier separately. One cabinet can carry several progressive tiers and they do not have to share a mechanic. The overhead sign is marketing; the tier's own label is the specification.

Two concrete examples. Buffalo Link is a must-hit-by design, the ceiling is stated, so the counter's distance from it is readable. Lightning Link's jackpots are random, not must-hit-by, despite the strong family resemblance. Same style of cabinet, same tiered display, completely different question to ask.

The honest caveat

Finding a genuine must-hit-by is not the same as finding a play. A stated ceiling only tells you the distance is finite. Whether it is worth covering depends on what it costs to cover the remaining gap at the bet level that qualifies for the jackpot, and on whether someone else sits down and takes it before you do. Plenty of legitimate must-hit-by machines are not worth a single spin.

The distinction is still the first filter. If there is no published ceiling there is nothing to measure, and no amount of watching the number will change that.

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We also publish at Run the Slots on WordPress, and keep reference notes on machine mechanics at Run the Slots guide notes.

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