Mega Joker (NetEnt) review: how to actually get the 99% RTP
The headline number, in context
NetEnt's Mega Joker is regularly cited as one of the highest-RTP slots in existence, and at 99.00% that claim holds up — with a crucial asterisk. Released in 2009, it is a deliberately retro three-reel, five-line fruit machine built around a two-tier structure: a low-stakes base game and a high-stakes "Supermeter" mode stacked above it. The 99% figure is the theoretical return when you play the Supermeter at the maximum 10-coin stake. Most casual players never see it, because they collect their wins from the base game instead of pushing them up into the Supermeter, and they bet below max. In that mode the game returns roughly 76.9%, which is dismal even by slot standards.
This makes Mega Joker a genuinely excellent slot for an informed, disciplined player and a poor one for everyone else. The mechanic is honest — NetEnt publishes both figures — but it is rarely explained on the affiliate pages that list "Mega Joker 99%" without qualification. That gap is exactly why we flag it with a bet-dependent tag in our RTP database.
How the Supermeter and coin-bet mechanic work
Each spin in the base game is played for one to ten coins. When you win in the base game you are offered a choice: collect the win, or transfer it up to the Supermeter. The Supermeter is where the maths turns in the player's favour: it carries higher-value symbols, a mystery win, and the structure that lifts the long-run return toward 99% — but only at the top coin level. Collect too early, or play at a low coin value, and you stay anchored in the unfavourable base game.
In practice the optimal-RTP approach is to play at the maximum coin denomination and feed wins into the Supermeter rather than banking them. That demands both a larger bankroll and the discipline to keep risking accumulated wins — the opposite of how most people play. The £10 max bet is modest in cash terms, but the strategy is psychologically counterintuitive, which is the real barrier.
What we like — and don't
Strengths
- Borderline-best RTP in the entire market (99.00%) when played correctly
- Transparent, classic mechanic with a real skill/discipline element
- Low £0.10–£10 stake range keeps the optimal strategy affordable
- Carries a small progressive jackpot on top of the base maths
Weaknesses
- Full 99% only at max coin + Supermeter; ~76.9% otherwise
- High volatility — the high RTP does not feel "safe"
- Tiny 200x max win versus modern high-RTP slots
- Frequently restricted or weighted low on bonus wagering
- Dated visuals won't suit players wanting modern features
Verdict
Skip if: you bet small, dislike variance, or want a big-ceiling slot — its 200x cap and bet-dependent RTP work against casual play.
Mega Joker earns its legendary status, but only on its own terms. Treated as a precision instrument — max coin, Supermeter, long sessions — it offers a house edge as low as 1%, which almost nothing else in a real-money lobby can match. Treated casually, it is one of the worse-value slots you can spin. We rate it highly for the informed player and warn everyone else to read the coin-bet mechanic before believing the 99% headline.