Crazy Numbers

For all game lovers who love maths and like to play simple but skillful games but every time different crazy challenges.
Easy to Difficult level to suit everyone.
Just arrange randomly placed 16 numbers sequentially. Left to right, top to bottom.
Numbers can be swapped at its position just by moving a number over any other number.
You have just 3 minutes to finish any challenge in any level.
If it sounds simple and crazy then try it and you will know what you are missing. It is exciting and addictive.
Seven levels to play.
1st level - Positive numbers 1-16.
2nd level - Positive numbers 1-100.
3rd level - Positive and negative numbers.
4th level - Decimal numbers.
5th level - Addition with Positive numbers 1-16.
6th level - Subtraction with Positive numbers 1-16.
7th level - Roman numbers.
You can Replay as many times you want any level or skip to the next the level anytime.
A link to Help (Youtube) tutorial is also provided.