This is a collection of some well known riddles. You can play "8 Queens", "Knight's tour", "Solo" and "Lights". For all games variations are offered and you can also computer search for a solution.

1. Click the download button to Downloading Page.

2. For Normal APK File, you can direct download the file, or you can choose fast download the file with our Installer.

3. For Speicial file such as XAPK or BAPK, you must to choose fast download the file with our Installer.

4. When you finish the file downloading, you must allow your phone to install the file from unknown resource.

v1.91
- Added Lights Out

v1.9
- Added support for triangular and diagonal moves in Solo
- On-board buttons (Undo, Restart, Solve)
- A message appears when no more moves are left

v1.62
- Changed icon
- Fixed Solo custom boards bug

v1.6
- New scores screen.
- Better support of larger screens.
- One new Solo theme.
- Option for displaying connecting lines in Knight's tour.

v1.5
New puzzle selector

v1.4
Solo: Added custom boards feature. User can create and solve her own boards.