One of my favorite games of all times.
Machinarium is a puzzle point-and-click adventure game developed by Amanita Design. It is notable in that it contains no dialogue, spoken or written, and apart from a few tutorial prompts on the first screen, is devoid of understandable language entirely. The game instead uses a system of animated thought bubbles. Easter egg back story scenes in the same format can only be revealed by idling in certain areas.
The game employs a two-tier hint system. Once per level, the player can receive a hint, which becomes increasingly vague as the game progresses. Machinarium also comes with a walkthrough, that can be accessed at any time by playing a minigame. As with dialogue, the walkthrough is not in written or spoken form, but instead a series of sketches describing the puzzle at hand and its solution. However, the walkthrough only reveals what must be done in that area, and not how that puzzle relates to the game chronology.
I got the game as part of a humble bundle and I instantly fell in love with the little robot (I am convinced his name is cutiepie). Some puzzles are impossible to do with a lag. I was streaming most of it and had to take down the stream for one part (but I was playing on a 13 inch laptop). It has a huge d'awwwww-factor but the puzzles are challenging enough while not being too hard (I only got frustrated once.)