When comparing Quell+ vs Duet, the Slant community recommends Duet for most people. In the question“What are the best puzzle games for Android?” Duet is ranked 9th while Quell+ is ranked 23rd. The most important reason people chose Duet is:
Duet does not require an internet connection for the game to be played, making it an ideal game to play when there is no internet connection available.
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Pros
Pro Polished presentation
Quell+ takes the extra step to have a very polished presentation. First there are no loading screen, so all menus and levels move along smoothly and have zero wait times in any transition. Second is that there is a very artistic design around each level where in a user navigates menus that are presented as a story one must reveal. The overworld is presented as a bookshelf that contains different years as shelves, each shelf has a selection of levels that have an certain theme, changing with each year selected. Overall it is a unique representation that shows a lot of polish over other casual puzzle games.
Pro Superb level design
Though the basis of the game is simple enough, collect all fragments in a level with as little moves as possible, there is quite a bit of good level design that uses a few different elements to make the gameplay challenging. Things like being able to teleport across the board or blocks that appear to block your path once passed over make each level more challenging than the last due to smart level design.
Pro Can be played offline
Duet does not require an internet connection for the game to be played, making it an ideal game to play when there is no internet connection available.
Pro Simple yet interesting graphics
At a first glance, the graphics of Duet appear rather simplistic, but on closer inspection one notices how much detail there is, from the moving background to the high resolution support.
Pro Can be played in the player's preferred orientation
Whether the player prefers playing in portrait view or landscape Duet supports it.
Pro Supports immersive mode
Duet supports immersive mode on Android devices that are on 4.4+ (KitKat or above). Immersive Mode allows you to 'hide' the on-screen navigation buttons and the top status bar in order to get a full screen experience.
Pro Excellent soundtrack
The soundtrack for Duet was created by composer Tim Shiel and matches the game graphics perfectly.
Cons
Con Not a lot of replayability once beaten
Once the game is beaten and all puzzles are solved there is not much reason to revisit the game as there is nothing else left to do, so sadly there is not much replayability once the game is completed.
Con Extremely difficult
Even though the levels are only 20 seconds long, the difficulty of each level is so high that it takes several attempts before a stage is completed.