Expert Sudoku with 15’000 puzzles in eight different variants and in eight difficulty levels.

* Eight different Sudoku variants: Classic & Jigsaw puzzles (aka Squiggly), Asterisk-, Centerdot-, Color-, Hyper-, Percent- & X-Sudokus
* Eight difficulty levels: very easy, easy, moderate, advanced, hard, very hard, fiendish, nightmare
* Five input methods (digit first, cell first, mixed, Andoku, popup)
* Pencil marks with auto set or auto erase
* Persistent undo/redo
* Auto save
* Bookmarks
* Highlighting of selected digits and pencil marks
* Highlighting of completed digits
* Highlighting of incorrect digits
* Coloring mode (cells and pencil marks) to support coloring solving techniques
* Very advanced hint functionality
* Analysis functionality to rate the difficulty of a Sudoku puzzle and to get a detailed list of required solving techniques
* Game statistics: fastest, average, slowest times for each difficulty level
* Extremely configurable

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A polar graph is a math concept where the distance r from the center of the graph is determined by an equation (r=1 would be a circle. r=sin(angle) makes loops). Normally you start the angle from 0 and go all the way around to 360 degrees incrementing by some small amount. When you skip say every 80 degrees, you get something interesting. Trigonometrics takes this maurer rose idea and puts you in control of every aspect of the design. The size, location, color palette, amount to skip, and a multiplier for the angle (to determine how many petals your maurer rose will have).

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Just after waking up in a hospital, Grandpa Willy quickly realizes that there’s something fishy going on and that the world has changed. There’s no time to ask questions though since the zombies are already pounding on the door. “Grandpa and the Zombies” is a fast-paced trip through 90 levels and three different worlds, which shows that you can also survive a zombie invasion in a wheelchair. The levels are filled to the brim with the craziest undead that make Grandpa Willy’s escape that much harder including stinky Halitosis Jack or the Forklift of Evil. Some of the undead can even be really helpful if you know how to interact with them. A cool head, logic and vision are called for in order to reach the saving elevator move-by-move in every level while collecting as many candies as possible. Grandpa Willy is not in the mood for zombies but he loves candy more than anything and is willing to make a detour for this. Steer Grandpa Willy’s wheelchair through the various levels. Grandpa Willy will roll only as far as he can until reaching an obstacle. And this better not be a zombie! Use obstacles, light declines and hazards cleverly and disorient the zombies. This is how you reach the saving elevator.

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My RPN calculator is a scientific and financial calculator inspired by the Hewlett-Packard HP-10C series pocket calculators of the 80s, most notably the HP 12C and HP 15C models. It features classical 4 operations, logarithms, trigonometry, statistics, financial, conversions tables, and macros for easy programming. It also features complete support for complex numbers along with 2nd, 3rd, and 4th degree equations solving. Its unique magenta L key allows switching from one layout to another, thus saving space on small displays like smartphones without compromising usability.

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Atomus is a kinetic interactive visualizer but also it is a work of art. Atomus was designed for helping people who want to think more creatively or who need a change of pace. However, I believe it could be a game/ toy/ party material/ interior design element for anyone who ever loved fireworks, whirlwinds, firefly lights, aurora, rainbow, wave, mobius strip, heart or atomic symbol. I have put something in the app which remind you of those and more , but it’s intensely dynamic and also you are able to control all of those.

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