Comparison

Zero/Sum vs Métropolitain

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Zero/Sum

Solve mathematical puzzles to uncover a cure for cancer in this unique puzzle game. Experience an 80s action movie-inspired storyline with live-action cinematics and a variety of fresh puzzle mechanics. Features daily challenges and time trials.

Highlights
  • Unique and original puzzle gameplay
  • 80s action movie-inspired storyline
  • Full motion video cinematics with real actors
  • Variety of puzzle types (melting, number)
  • Daily Challenge Mode with new puzzles
  • Time Trial mode
Features
Read full description

On the eve of discovering a mathematical cure for cancer, your mentor, Professor Claire Liddy, is murdered. Fortunately, before she died, the Professor was able to erase many of the plus and minus signs with her bloody hands, saving the cure from falling into the hands of her killers. Now it is up to you to fill back in the missing parts of the equation and resolve your professor's cure. It's up to you to cure cancer -- AGAIN! (It's a comedy). FEATURES - A completely UNIQUE and ORIGINAL puzzle game! - Puzzle gameplay that will make you feel and look SMART! - A thrilling, 80s ACTION MOVIE-inspired storyline! - Full motion video GREEN SCREEN cinematics! With REAL human ACTORS! - NO mention of CANDY or CUPCAKES or sweets of any kind in the story at all! - A variety of different puzzle types and mechanics to keep things FRESH (melting puzzles, number puzzles, and so much more)! - A Daily Challenge Mode featuring 10 NEW puzzles EVERY DAY! - Time Trial mode - try to beat your best time on RANDOM PUZZLES! - Completely INDEPENDENTLY developed and published! (Support your local punk band)! I ignored my newborn child to make this game, please ignore yours to play it!* *Note: I worked on the game every night after my son fell asleep, there is nothing more important to me than being a father. That being said, this game is a CLOSE second. Like neck and neck, really.

About

Métropolitain

Guide travelers through the Paris metro in 1924. Help passengers catch the correct train on time by providing directions. Explore historically accurate stations and unlock fascinating details about their origins.

Highlights
  • Guide passengers to correct trains
  • 25 historically modeled levels
  • Uniquely generated levels
  • Unlock historical station details
  • Challenging time-based gameplay
Features
Read full description

Paris, 1924. The eve of the VIIIth Olympics. The midst of Les Années Folles. A bustling Saturday night. Locals and tourists alike, travelling from the bohemian bistrots to the late night cabarets or early morning shifts. All navigating their way through the maze which is the newly built Métropolitain. Can you help them catch their correct train on time? You are chef de gare for the Paris metro, serving as host and guide of the station. During your shift, travellers will ask for directions where their train of choice is leaving. Guide them correctly and earn their respect, failing to do so and it will drop. It is a hectic night with big crowds and only little time; how many travellers can you successfully help? Métropolitain consists of 25 levels, each modeled on historic representations of famed stations. From Concorde, Caumartin & Châtelet to Pigalle, Palais Royal and Place de Clichy. All while passing by closed stations like Saint-Martin restored to their former glory. All levels are uniquely generated each time, delivering a fresh look at history with each play. Upon completion of each level you unlock more details about the history of each station and the origin of the names. Step back in history and discover the stories behind the Métropolitain and the City of Lights.

Screenshots

Zero/Sum4 screens
Métropolitain4 screens

Verdict

The call

The clearest difference is price: Zero/Sum at Free against Métropolitain's $0.99. Zero/Sum also leads on iOS requirement (8.0 vs 13.0). Métropolitain's advantage is update cadence (daily vs every 2 months). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Zero/Sum is free to download; Métropolitain costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Zero/Sum ships an update every 2 months, Métropolitain daily. Both last shipped on November 2, 2026.

Scorecard4 real differences · 6 level
Zero/Sum versus Métropolitain: the parameters behind the verdict, then further details
ParameterZero/SumMétropolitain
PriceFree — better$0.99
Rating4.2 (27 ratings) — better—
Positive reviews53.8% of reviews — better50.0% of reviews
Number of ratings27 — better—
Update frequencyEvery 2 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS8.0 — better13.0
Further details — not scored
Size973 MB48 MB
Age rating12+4+
DeveloperSean KearneyJeroen Keij

Customer experience

Zero/Sum

All ratings27 ratings
Positive77.8%
Neutral7.4%
Negative14.8%
Written reviews13 reviews
Positive53.8%
Neutral23.1%
Negative23.1%

Métropolitain

Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Zero/Sum

No in-app purchases

None

Métropolitain

No in-app purchases

Questions

Is Zero/Sum free?
Zero/Sum is free to download, with no in-app purchases.
Is Métropolitain free?
Métropolitain costs $0.99, with no in-app purchases.
Do Zero/Sum or Métropolitain have ads?
Neither Zero/Sum nor Métropolitain shows ads.
Which is updated more often, Zero/Sum or Métropolitain?
Zero/Sum ships an update every 2 months, and Métropolitain daily. Most recently, Zero/Sum was updated on November 2, 2026 and Métropolitain on November 2, 2026.

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