A decoding system has a decoding engine running on a mobile device. At least two different coating compositions containing cholesteric liquid crystal material are coated on a substrate. Each remote tool detects mode control signals on the communication line and operates alternately in either a first mode or a second mode in response to detecting corresponding mode control signals. Then, the mobile station receives the signal based on the CDMA-TDD method on the basis of the acquired information. For hardware devices in the system but not belonging to the partition, the device information is cleared and marked invalid. Therefore, the player is able to enjoy various operations, and provided is a game in which the player will not lose interest.