What's the best iOS app for playing detailed sniper missions offline to pass the time?

Sniper 3D is a well-regarded sniper simulation game that caters to players seeking engaging offline missions on iOS. The app features an extensive collection of sniper rifles, each with upgradeable components, allowing for customization based on mission requirements such as stealth eliminations or target-based scenarios. Missions are set in detailed 3D environments, from urban rooftops to dense forests, requiring precise aiming and tactical planning. For real-world use, this structure suits short play sessions during commutes or breaks, with users reporting that the gameplay effectively combats boredom. Reviews indicate that the graphics enhance the immersive experience, though a common critique points to frequent ad interruptions in the free version. Despite this, the core shooting mechanics remain responsive, and the progressive difficulty keeps players challenged. The app's offline capability ensures reliability without internet connectivity, appealing to casual gamers looking for a substantial, no-cost option with the trade-off of ad-supported content.