Brain Test 4: Tricky Friends represents Unico Studio's latest iteration in their popular puzzle game series, maintaining the franchise's signature approach to lateral thinking challenges while introducing new mechanics. The game positions itself in the crowded puzzle market by emphasizing its 'back-to-basics' philosophy combined with fresh content, targeting both existing fans and new players seeking cognitive exercises. The core gameplay revolves around solving increasingly complex puzzles that require unconventional thinking rather than traditional logic. New customization mechanics allow players to personalize their experience, while the expanded character roster adds narrative depth to the puzzle-solving process. The game operates entirely offline, making it suitable for use in various environments without internet connectivity. Puzzle types range from visual perception challenges to mathematical conundrums and word-based brain teasers, providing diverse mental stimulation across approximately 100 unique levels before content repetition occurs. User interface design maintains the series' minimalist approach with intuitive touch controls and clear visual feedback. The game demonstrates particular strength in its pacing, gradually introducing complexity while maintaining accessibility. Real-world usage patterns show the app serves as both a quick mental break during short intervals and extended puzzle-solving sessions. The ad-supported model provides free access but impacts the experience through intermittent video advertisements between levels. User feedback analysis reveals consistently high ratings (4.7/5) with specific praise for cognitive benefits. Pratyush Hazarika (July 30, 2025) noted the game 'triggers our presence of mind' and helps maintain focus. However, Varsha Ankit Agarwalla (July 31, 2025) raised concerns about '18+ videos' in advertisements, highlighting potential inappropriate content for younger audiences. Gwendolyn Pitcairn (July 28, 2025) identified level repetition after approximately 100 puzzles, indicating content recycling issues in extended play. The application excels in providing engaging mental exercises with varied puzzle types and smooth gameplay mechanics. Primary limitations include advertisement content concerns and eventual level repetition. Ideal for puzzle enthusiasts seeking casual cognitive challenges, though parents should monitor advertisement content when used by younger players. The game successfully refreshes the established formula while maintaining the series' core appeal through well-designed puzzles and new customization options.