1) Objectives
Legged robot game is a developed game from previous IRO categories to understand the programming and mechanical structure of vertical moving ability of the robots with understanding of humane walking system. The participants should be able to construct the algorism to solve the maze using censers and comprehension of human articulations.

2) Participants
Junior League /Challenge League

3) Team Formation
2~3 persons and 1 robot per team

4) Game Method
4-1) Junior League
A playground assigned on the game day by the committee will be used for Up Stairs. According to the number of steps assigned on the day, robots should step up the stairs and stop at an assigned stair as fast as possible and solve the maze to the finish line. .

4-2) Challenge League
A playground assigned on the game day by the committee will be used for Up Stairs. According to the number of steps assigned on the day, robots should step up the stairs and stop at an assigned stair as fast as possible and solve the maze to the finish line. In Challenge League, the stairs may have ups and downs.

5) Game Rules
* Robots should be constructed in 3 hours.
* Robots should work with an independent electric power supply. Combustion power (e.g. engine) is not allowed. Direct control by the participants is not allowed except the starting of the robot.
*The participants should use a controlling part of robot after setting up in advance; on the contrary, other parts except the controlling part should be constructed on a field spot.
*Robots should walk up or down step by step. For every step, the whole body of the robots should be within the area of the stair.
* Robots’ size is not restricted. But the size of the robots should be changed appropriately according to the size of the playground . Otherwise, the team will be disqualified.
* Robots’ action should be performed by leg-shaped component or corresponding component utilizing leg moving mechanism.
* Robots, which use wheels or caterpillars for movement, will not be admitted.
* Computer is allowed for programming. Each team should take the lab-top for programming by itself.
*Robots must stop more than 3 seconds on the finish line.

6) Playground
* Each stair size is 60cmX60cmX3cm (length/width/height).
※ For Junior League, stair size is 60cm X60cmX1.5cm (length/width/height).
* A 5cm wide black line is drawn on the middle of step that led to maze solving line.
*The maze solving playground will be connected to the stairs and it could be placed before or after the stairs.

7) Method of Scoring
* Ranking is decided by the average of two recorded tracking time.
* Tracking time is recorded by sensors. In case of unexpected situation (out of power, sensor breakdown), scorers will test the tracing time.
*If the participants touch the robot without permission from the judge or the chair the team will be disqualified.

8) Tie breakers
* When Tie is occurred, the faster one in the first game is a winner.