What's the best Android app for playing classic solitaire in short bursts without annoying ads?

Zen Solitaire is a highly polished Android application focused on delivering a straightforward classic solitaire experience, specifically designed for casual play during downtime. With a 4.9-star rating, it excels in scenarios like waiting in line, during coffee breaks, or while traveling, thanks to its fast load times and intuitive interface. The app features an ad-light model where advertisements are infrequent and non-intrusive, often placed between games rather than during gameplay, which users appreciate for maintaining flow. Additional specifics include customizable card decks and backgrounds, a reliable auto-save function that picks up exactly where a session left off, and subtle sound effects that enhance relaxation without distraction. Reviews indicate that players value its simplicity; one user noted it as 'a great passtime while waiting,' highlighting its role in short, stress-free sessions. However, some minor drawbacks exist, such as a hint system that can be overly basic for experienced players and occasional delays in theme loading on older devices. Despite these, Zen Solitaire balances accessibility with enough visual options to keep the experience fresh, making it a solid choice for those seeking a reliable digital version of the card game without the friction of constant monetization prompts.