Abstract: A method includes establishing a communication session between a first second terminal, the communication session involving a game battle between a first user of the first terminal and a second user of the second terminal, providing a first entry request function to a third terminal to enable a third user of the third terminal to observe the game battle while the game battle is in progress, providing information for a battle screen corresponding to the game battle in progress in response to a request received through the provided first entry request function, providing a first join request function to the third terminal through the battle screen to enable the third user to join the game battle in progress, and processing the game battle among the first user, the second user, and the third user, in response to a request received through the provided first join request function.

Abstract: Provided are a method and a system for expanding a unit placement space in a game. A unit placement space expanding method may provide a user with a function capable of arbitrarily expanding a limited space in which units are placeable in a game using resources provided from the game, and may allow users to place a unit through a secured space only when a unit placement space is secured in advance. Accordingly the users may expand a space by strategically placing units and entertain strategic advantages during the game.

Abstract: A game replay method includes providing a list of games played by a user; replaying a game selected from the list of games based on game data corresponding to the selected game; providing a recording function of the game being replayed; generating and storing a video of the game being replayed through the recording function; and providing a share function for at least one of the stored video and an access link to the game data.

Abstract: Provided is a method of producing a rhythm game according to an embodiment of the inventive concepts that includes extracting a main sound source of a music signal by based on a plurality of channel signals included in the music signal; extracting a peak period from the main sound source; and designating a rhythm note that requires a tap input from a user to correspond to a timing of the peak period.

Abstract: An image rendering method includes: loading, at an electronic device, an image by an application executed on the electronic device; loading, at the electronic device, reference color arrangement information; and determining, at the electronic device, a pixel format for a texture creation of the loaded image based on a comparison between a color value of the loaded image and the loaded reference color arrangement information.

Abstract: A service system for providing a service using a social group community function and a method therefor are provided. The method includes transmitting information, on a list of a chat room associated with a content providing service among a plurality of chat rooms managed in the SNS, to a server which provides the content providing service according to a request from the server which provides the content providing service a user of the SNS accesses, receiving information about a chat room selected by the user on the list of the chat room and link information from the server, and providing the link information to participants of the selected chat room through the selected chat room.