The present invention introduces a simulation device which produces first object on a display means, and said first object is capable of being operated by input means. The present invention also has the following characteristics. First, said first object is composed of body part, first part, second part, third part, and fourth part. Second, said body part and said first part are connected by first joint, said first part and said second part are connected by second joint, said second part and said third part are connected by third joint, and said third part and said fourth part are connected by fourth joint. Third, when said fourth part contacts second object said fourth part maintains horizontal relationship with said second object until said fourth part terminates contact with said second object thereby said simulation device produces a realistic view of human being or similar creature doing certain motions such as, but not limited to, walking, jumping up and down, and/or crouching on the ground.