Percentage Calculator

Usage: Online percentage calculator, used to find and familiarize with percentages, by interracting. 
Math Knowledge Board

How to use:  Enter two known values to find the third one.

Mercury Craters

Usage: Free, fast online game for some of the biggest Mercury craters.
Astronomy Knowledge Game.  

How to play: Move the lander with the arrow keys and cros Mercury surface to find 10 craters.

Crop Pests Fun Game

Usage: Free educational arcade game, used to explore some garden insects, by interacting. Biology apps collection.

Interactive Knowledge Board. 

How to play: Click the crop to shake it and see what vermins lure there.

Metals Hunt Chemistry Game

Usage: Free educational arcade game used to explore 8 precious metals from the periodic table, by interacting.
Fun Knowledge Game.    

How to play: Move the ship with arrow keys and hunt the metal deposits.

Daily Chemical Compounds

Usage: Free educational application used to explore 11 chemical compounds, by interacting.
Interactive knowledge board.    

How to play: Drag and drop the chemical elements that constitute the compound.

Periodic Table Puzzle

Usage: Free educational test application used to explore all the elements from the Periodic Table, by interacting.
Interactive knowledge board.    

How to play: Drag and drop all chemical elements on their places in the periodic system.

Alkali and Alkaline Earth Metals

Usage: Free educational test application used to explore part of the Periodic Table, by interacting.
Interactive knowledge board.    

How to play: Roll the Alkali and Alkaline Earth metal elements on their place in the periodic table.

Lanthanide and Actinide Metals

Usage: Free educational test application used to explore the Periodic Table article, by interacting.
Interactive knowledge board.    

How to play: Roll the Lanthanide and Actinide metal elements on their place in the periodic table.

Transition Metals

Usage: Free educational test application used to explore the Periodic Table article, by interacting.
Interactive knowledge board.    

How to play: Roll the transitional metal elements on their place in the periodic table and unlock the vault.

Isometric Hunt

Usage: Fun educational game, used to familiarize with the Isometric Projection Figures by interracting. 
Knowledge Arcade Game

How to play:  Move with arrow keys and gather only focused figures.

Basic Geometry

Usage: Fun educational game, used to familiarize with the Basic Geometric Figures by interracting. 
 Interactive Knowledge Board

How to play: Try to guess the names of some simple geometric figures.

Random Walk Arcade Game

Usage: Fun educational game, used to familiarize with the Random Walk concept by interracting.  Math apps collection.
 Knowledge Arcade Game

How to play: Point and click the squares to remove them before the Random walk reach them. 

Statistics Knowledge Board

Usage: Free educational board, for 3 useful formulas from Statistics. Math apps collection.
Interactive Knowledge Board

How to play: Click one of the circlets to fill the empty sockets. 

Logic Figures 1 Picture Test

Usage: Free educational test game, that train skills in Intelligence Quotient, by interacting. Logic apps collection.
Interactive Knowledge Board

How to play: Drag and drop the correct figure in the empty slot of the pattern. 

Unicellular Organisms Arcade Game

Usage: Free educational arcade game, used to explore the Unicellular Organisms, by interacting. Biology apps collection.
Online Arcade Game.  

How to play: Move the robot with the arrow keys. Fire the web with space bar and return the cells in the jars...

Body Cell Types Quizz

Usage: Free educational quizz game, used to explore the Body Cell Types, by interacting. Biology apps collection.
Interactive knowledge board.  

How to play: Point and click the focused cell where it belong in the human body...

Saturn Moons Puzzle

Usage: Free, fast online reference for Saturn's natural satellites article, by interacting.
Interactive knowledge board.  

How to play: Drag and drop the planet's picture on their correct places...