This is demo version of the text with 81 questions and provided for entertainment purposes only. Text has two main aims: The first one is to show the abilities of macromedia flash technologies in creation of educational tools that can be used in distant learning by means of internet. The second one is to give user of this program ability to evaluate his mental skills in resolving different puzzles. The time for single task is just 60 seconds. You can add time for solving task by pressing button, but in this case your score will be reduced by 1 point. To start test click on button. After completions of all tasks you will obtain key to practice any single task. Good Luck!