Poly Rules! vs CrushStations
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Dynamic rule changes
- Increasingly complex scenarios
- Cognitive benefit focus
- Research support available
- Log storage and analytics (coming soon)
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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.
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.
- Working memory training
- Executive function development
- Creature memory challenges
- Educational game design
- Research-backed gameplay
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
Poly Rules! ships an update monthly, CrushStations every 13 months. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.
| Parameter | Poly Rules! | CrushStations |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (13 ratings) — better | 4.5 (11 ratings) |
| Positive reviews | 80.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 13 — better | 11 |
| Update frequency | Monthly — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 111 MB | 294 MB |
| Age rating | 4+ | 4+ |
| Developer | Northeastern University Information Services | New York University |
Customer experience
Poly Rules!
CrushStations
In-app purchases
Poly Rules!
No in-app purchases
CrushStations
No in-app purchases
Questions
Is Poly Rules! free?
Is CrushStations free?
Which has better reviews, Poly Rules! or CrushStations?
Do Poly Rules! or CrushStations have ads?
Which is updated more often, Poly Rules! or CrushStations?
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