A plausible match from 2010
The old title “Just Juggle” does not include a developer or App Store ID. A strong contemporary match is Denki’s Juggle!, covered in a June 2010 AppSpy review and discussed around its launch in a Pocket Gamer interview with Denki’s Gary Penn. The original page has not been recovered, so this is contextual history rather than a claim that its exact subject has been conclusively identified.
Period coverage describes a paddle game about keeping multiple objects in the air. That simple premise makes it a useful example of design for short sessions.
Small rules can create interesting decisions
A single-screen game can explain its objective almost immediately. Its depth then comes from timing, attention, and the relationship between risk and reward. The interesting question is whether an extra object creates a meaningful choice or simply makes the screen harder to read.
For this kind of game, readable movement matters more than a long feature list. The player should understand what happened after a miss and see a plausible way to improve on the next attempt. Fast restarts can make experimentation enjoyable without a complicated progression system.
What to inspect in a modern equivalent
Look for clear visual contrast, comfortable control placement, and a pause option that fits interrupted phone use. Check whether important cues are available visually as well as through sound. A small screen should not require a finger to cover the next obstacle.
Contemporary reviews of Juggle! are evidence about the historical release, not a current compatibility or download guarantee. Before purchasing a similarly named game, verify its developer and present listing. The lasting lesson is a design principle: a focused interaction can deserve attention even when its entire premise fits in one sentence.