Comparison

Poly Rules! vs CrushStations

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

Head to head
About

Poly Rules!

A challenging sorting game where the rules dynamically change as you progress. It offers increasingly complex scenarios to test your cognitive abilities. Researchers can inquire about using the game for studies.

Highlights
  • Dynamic rule changes
  • Increasingly complex scenarios
  • Cognitive benefit focus
  • Research support available
  • Log storage and analytics (coming soon)
Features
Read full description

PolyRules is a challenging sorting game where the rules change as you play. As you progress through the game you will encounter increasingly more complicated scenarios that challenge you in ways you can't imagine. The current release is our first prototype and we will update the game semi-frequently as we move towards a design that features tried and true game design to facilitate the cognitive benefits this game aids to provide. Researchers who are interested in using this game for their own studies please reach out to us to us through our support page for more information on how to best use this App. We have several ways to support you including a central server to store logs and automatic analytics which will be implemented in the coming weeks.

About

CrushStations

This game trains working memory, a key executive function, by challenging players to remember creature colors and types to rescue them from an octopus. It's designed to improve cognitive skills linked to academic success.

Highlights
  • Working memory training
  • Executive function development
  • Creature memory challenges
  • Educational game design
  • Research-backed gameplay
Features
Read full description

CrushStations is a game designed to train working memory, a subskill of executive functions. Working memory involves holding information in mind and mentally working with it (Diamond, 2013). Players need to remember the color and type of creatures to free them and keep them out of reach of the hungry octopus. How does this support learning? Executive functions refer to a set of top-down, goal-oriented cognitive processes that enable people to control, monitor and plan behaviors and emotions. Miyake and Friedman’s model supports a unity-and-diversity view of EF in that it incorporates the three distinct but related components of EF: inhibitory control, task-switching and updating (Miyake et al., 2000). What is the research evidence? Our research suggests that CrushStations is an effective way to train working memory. The study supporting this claim will be published soon. Research has found that EF is related to performance in literacy and math along with long-term gains in school performance and academic readiness (Blair & Razza, 2007; Brock, Rimm-Kaufman, Nathanson, & Grimm, 2009; St Clair-Thompson & Gathercole, 2006; Welsh, Nix, Blair, Bierman, & Nelson, 2010) and that disparities in EF among preschool children from low-income versus high-income homes may contribute to the achievement gap (Blair & Razza, 2007; Noble, McCandliss, & Farah, 2007). This game is part of the Smart Suite, created by New York University’s CREATE lab in collaboration with the University of California, Santa Barbara, and The Graduate Center, CUNY. The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through Grant R305A150417 to the University of California, Santa Barbara. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.

Screenshots

Poly Rules!4 screens
CrushStations4 screens

Verdict

The call

The clearest difference is review sentiment: Poly Rules! at 80% against CrushStations's 50%. Poly Rules! also leads on update cadence (monthly vs every 13 months) and rating (4.8 vs 4.5). On price, ratings volume, ads and in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Poly Rules! holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 13 and 11 respectively. Written reviews point the same way: 80% of Poly Rules!'s written reviews are positive against 50% of CrushStations's.

UpkeepUpdate frequency

Poly Rules! ships an update monthly, CrushStations every 13 months. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.

Scorecard3 real differences · 7 level
Poly Rules! versus CrushStations: the parameters behind the verdict, then further details
ParameterPoly Rules!CrushStations
PriceFreeFree
Rating4.8 (13 ratings) — better4.5 (11 ratings)
Positive reviews80.0% of reviews — better50.0% of reviews
Number of ratings13 — better11
Update frequencyMonthly — betterEvery 13 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size111 MB294 MB
Age rating4+4+
DeveloperNortheastern University Information ServicesNew York University

Customer experience

Poly Rules!

All ratings13 ratings
Positive92.3%
Neutral0.0%
Negative7.7%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

CrushStations

All ratings11 ratings
Positive81.8%
Neutral18.2%
Negative0.0%
Written reviews4 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

In-app purchases

None

Poly Rules!

No in-app purchases

None

CrushStations

No in-app purchases

Questions

Is Poly Rules! free?
Poly Rules! is free to download, with no in-app purchases.
Is CrushStations free?
CrushStations is free to download, with no in-app purchases.
Which has better reviews, Poly Rules! or CrushStations?
Poly Rules! is rated higher. Poly Rules! averages 4.8 out of 5 from 13 ratings, while CrushStations averages 4.5 from 11 ratings.
Do Poly Rules! or CrushStations have ads?
Neither Poly Rules! nor CrushStations shows ads.
Which is updated more often, Poly Rules! or CrushStations?
Poly Rules! ships an update monthly, and CrushStations every 13 months. Most recently, Poly Rules! was updated on September 8, 2026 and CrushStations on September 22, 2026.

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