Is there a good iOS puzzle game with an unexpected hidden joke or Easter egg?

Pixel Flow! is a deceptively simple flow-style puzzle game where players connect colored dots to fill a grid. The core gameplay is clean and methodical, offering a familiar but satisfying logic challenge. However, the app has garnered a specific reputation for featuring a well-concealed and widely discussed Easter egg. Upon reaching level 103, players encounter a QR code. Scanning it leads to a classic internet prank, a detail that has become a significant point of discussion in user reviews. Many players express amused shock, with some noting it was the reason they chose to rate the game. This hidden element provides a memorable, community-driven moment that breaks from standard puzzle mechanics. Beyond the surprise, the game offers hundreds of levels with increasing complexity, suitable for short sessions. However, assessments must note significant drawbacks highlighted in feedback. Users report that an internet connection is required to play, which limits offline usability. Furthermore, the ad implementation is frequently criticized as intrusive and non-optional, which can disrupt the pacing. While the puzzle design is competent, the app's defining characteristic for many is that singular, shared experiential joke, making it a notable case study in how a hidden feature can drive engagement and word-of-mouth, albeit within a framework that has clear monetization frustrations.