To take the test, please log in and select your rating. You will be presented with 10 puzzles based on your chosen rating. You can solve these puzzles, and your selection will be saved

To take the test, please log in.
This experiment will take about 5 minutes.
During this task, two boards will be presented at a time. The boards will be of colored balls arranged on pegs.
Imagine that these balls have holes through them and the pegs are going through the holes.
Notice that the first peg can hold three balls, the second peg can hold two balls, and the third peg can hold one ball.
Your task will be to make the arrangements of balls in your board look like the arrangements of balls in the target board in the fewest possible moves.
The balls in the target board are fixed in place, but the balls in your board are movable.
You have to move them to make your board look like the target board.
Sometime you will have to move a ball to a different peg in order to get to the ball below it.
During this task it is important that you remember, you want the fewest possible moves that are required to make your board look like the target board.
You will have 20 seconds to make your decision.

In this task, four cards will appear on the screen. Each card has figures that differs in number, color, and shape.
From time to time, you will receive a new card, and your task will be to try to determine which of the four cards the new card belongs to.
You can categorize the new card by clicking on one of the four cards.
The correct answer depends upon a rule. We will not tell you what the rule is. However, we will tell you if your answer was correct or not.
The rule may change during the task.
When the rule changes, you should figure out what the rule is as quickly as possible.

To begin the test, log in to your account.
A 3x3 matrix will appear, and certain boxes will light up.
Your task is to remember the sequence in which the boxes light up and then click the boxes in the same order when it’s your turn.
Your results will be recorded and saved.

To begin the test, log into your account.
In this test, you will have to remember a sequence of numbers presented on the screen one after the other.
At the end of each trial, enter all the numbers into the onscreen number-pad in their correct order.
Example: If the sequence is '7 4 5 1', enter '7 4 5 1' in this exact order.
You will now be given practice trials to help you understand the task.