The computer program falls under the defini on of applica on so ware -it is intended for the end-user use. However, it contains a few elements, which make it more like a video game. Mul ple solu ons of each task are permi ed if they comply with the laws of thermodynamics and principles that are taught in physical chemistry courses. As such, students are encouraged to think outside the box and be more crea ve. This makes the game less linear. In general, in educa onal games, a player's score serves as the indicator of the performance. It may be analyzed at the end of the game -higher score means higher percentage of correct answers and therefore higher rank of a student/player among the peers. As such, a player's score does not influence directly the gameplay. The goal of playing ChemChallenge is also to gain maximum score upon comple on of all levels. However, the score may be used as in-game currency. Players may exchange the gained score for certain virtual items, such as special chemical compounds and lab equipment, at any me before the game is completed. These virtual objects possess addi onal func onality and offer more ways to solve tasks and an opportunity to receive even greater reward, which again can be "invested" into upgrading and customiza on of the player's laboratory.