Our accessibility experts are yet to assess Abdec. If you'd like to suggest accessibility features we should record for Abdec, let us know on Twitter or via email. You can also Tweet, to invite the developer  to complete our accessibility questionnaire.​Abdec is a brain-teasing book where you must solve incremental puzzles about placing shapes into grids. Play is initially about fitting the two Tetris-style shapes into the grid, but soon evolves into a challenge of deciphering what the inferred rules are to solve each page. It stands out for how these puzzles without rules invite the player to litigate what is and isn't allowed, while still offering an incredibly hard challenge.