From Match-3 to Kitty Sort: What 250 Levels for a 70-Year-Old Taught Us About Game Design
ChillBrain started as one match-3 board built for my mother. It is now 300 levels across three different games — fruit match-3, a tile-matching pile, and a kitten-sorting puzzle — and every design rule in it was learned the honest way: by watching a 70-year-old get stuck, squint, mis-tap, or quietly put the tablet down. These are the rules that survived contact with reality.
Rule 1: No timers. Ever.
Every senior-facing design guide says "reduce time pressure." We went further and removed the concept. Nothing in any of the 250 levels counts down. The surprising result: sessions got longer. Removing the clock removes the quiet fear of failing publicly, and what's left is the puzzle itself.
Rule 2: If two things look different, they must BE different
Our kitten-sorting game briefly shipped with a decorative basket that looked exactly as tappable as the game's real buttons. Players tapped it. Of course they tapped it — it was round, cute, and centered. The fix wasn't a tutorial tooltip; it was making the basket visibly inert (flat, no border, no shadow) and giving the real slots dashed outlines that light up when they're usable. Affordance isn't decoration; for older players it's the whole interface.
Rule 3: Fingers are bigger than you think, and screens are smaller
Our worst bug report was a screenshot: five kittens overlapping into a furry traffic jam because I let the layout squeeze them below 44 pixels on a small phone. The rule we enforce now: game pieces never shrink below thumb size — if they can't fit, the layout must change shape (fewer columns, more scrolling) instead of shrinking the pieces. Scrolling is easy for seniors. Precision-tapping a 30-pixel target is not.
Rule 4: Both tap-tap and drag must work
Younger testers dragged the kittens instantly. My mother taps: one tap to pick up, one tap to place. Neither group ever discovered the other method on their own. Supporting both — carefully, so dragging never blocks the page from scrolling — meant nobody had to be taught anything.
Rule 5: Feedback should be physical, frequent, and cute
The single most-loved change we ever shipped was not a feature. We recorded a real kitten meow and made picking up any kitten meow, and completing a set purr. Sound tied directly to the player's own action lands completely differently from ambient effects — it says "the game felt that." (We also learned to respect the phone's remove-animations accessibility setting without silencing the sounds — accessibility settings should soften a game, not mute its joy.)
Rule 6: Difficulty must climb, but kindness climbs with it
Our hardest levels hide information (you only see the front kitten of each shelf) and add more colors than working memory comfortably holds. The counterweight: free rest spots to park a piece, an always-free restart, and helpers that cost a soft in-game currency earned just by playing. The goal is a puzzle that makes a 70-year-old think hard — never one that makes her feel old.
Rule 7: Ship, watch, apologize, fix
Half of this article is disguised bug confession: the unclickable basket that got clicked, the overlapping kittens, the page that wouldn't scroll because the drag system claimed every touch. Designing for seniors isn't a checklist you complete before launch — it's a feedback loop with someone who will absolutely tell you the new interface is worse. Ours does. It's the most valuable QA department in the world.