If you're familiar with Otousan's work, you know what to expect from Abacus: a four-walled room with simple, gradiented graphics and plenty of puzzles, most of which center around a particular theme. In this case, the theme is the blue enigma machine over on the cabinet there and the circular tumblers that it uses.
Release Date: 01/11/2014
Abacus is developed by Otousan.
All you need are your brain and your mouse: click around the room to navigate, particularly the bars with the arrows if you want to change what you're looking at. Pick up items and use them (click to select, click to use), or use the "About item" button to get a good look at whatever you've selected. Solve puzzles all around the room, get everything figured out, and eventually get that door open.