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Engine Probably Fair Studio

New on Engine Nov 4

Nightmare

by Probably Fair Studio

Artwork: Probably Fair Studio

96.50%Published RTP (base)
36,666x betMax win (base)
6Game modes
v2Version
Engine’s version number for this game’s published math. A new version can change the numbers.

Game modes · v2

Each mode has its own published math.

  • Mode
    Each game defines its own modes, such as base play, ante or a bonus buy. The same name can work differently in another game.
    Published RTP
    The theoretical long-run return for this mode, as a share of what one round costs. It does not predict a single session.
    Mode cost
    The price of one round in this mode, in base bets. 100x bet means 100 times your base bet.
    Max win
    The biggest payout in this mode’s published math, in base bets. It is not a multiple of the mode cost.
    Max win chance
    How often the max win comes up per round in this mode, from the published math. Recent results don’t change it.
    Published outcomes
    How many outcomes this mode’s published math lists. Some have zero chance. This is not a count of player spins.
  • base base Published RTP96.50% Mode cost1x bet Max win36,666x bet Max win chance1 in 4,076,190 Published outcomes300,000
  • ante Published RTP96.50% Mode cost2x bet Max win36,666x bet Max win chance1 in 1,358,730 Published outcomes300,000
  • nightmare_bonus Published RTP96.50% Mode cost100x bet Max win36,666x bet Max win chance1 in 14,590 Published outcomes120,000
  • super_nightmare Published RTP96.50% Mode cost300x bet Max win36,666x bet Max win chance1 in 8,754 Published outcomes120,000
  • mystery Published RTP96.50% Mode cost500x bet Max win36,666x bet Max win chance1 in 5,137 Published outcomes120,000
  • bloodmoon Published RTP96.50% Mode cost2,000x bet Max win36,666x bet Max win chance1 in 100 Published outcomes92,346

Versions

  • v2 Current First seen Nov 4, 2026

Changes
What changed between versions since BigWinMaxxing started tracking this game. Nothing earlier is filled in.

  • Nov 4, 2026 First seen on Engine

Engine data

Official data from Engine’s public game catalogue and fairness API, checked daily. BigWinMaxxing only formats it, for example 1 in 89,000,000. New and Updated mean first seen by BigWinMaxxing.
First seen by BigWinMaxxing Nov 4, 2026. Math source ↗

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