The theme of ABU Robocon 2023- “Casting Flowers Over Angkor Wat” is a game involving two robots, namely a Rabbit robot (RR) and an Elephant Robot(ER), working in coordination to toss the rings onto the poles effectively. To comply with the problem statement, the ER has distinct features like a holonomic drive and various subsystems. The subsystems include the picking and loading mechanism, feeding mechanism, and throwing mechanism. The RR design requirements are similar to ER, with an efficient mecanum drive that can climb the wedge to reach the Angkor Wat area. Both robots have semi-autonomous functioning, and all mechanisms are designed to abide by the rule book to accomplish various tasks.

The theme of ABU Robocon 2022 was "Lagori", a traditional game from southern India that was popular in the 1990s. The game is played between two teams, "Seeker" and "Hitter", with the Seeker throwing a ball to break a stone tower called "Lagori". The Hitter then throws balls to interrupt the Seeker.

In 2021, ABU Robocon’s problem statement was based on "Throwing arrows into pots,” traditional etiquette and game in ancient China. It is a game of two robots collaborating to score points by throwing arrows into five different pots. Each team has a TR, the throwing robot, and a DR, the defensive robot. The game area is divided into two areas: inner and outer. The TR is bound to only the outer area, but the DR is free to move in any area of the team. The TR is allowed to throw and pass the arrows while the DR is permitted to pitch, intercept the pots and pick up arrows. When a team throws two arrows in a pot, it’s called twinning, and the game ends if any of the team can achieve twinning in all five pots. Otherwise, the team which performs the maximum score wins.

We designed all the mechanisms of both robots with semi-autonomous functioning to accomplish various tasks. The approach explicitly maintained a probability distribution over the robot's possible locations, taking into account multiple sources of uncertainty, including approximate knowledge of the environment and actuators and sensors uncertainty. Acknowledging various game plans and their consequences, both Throwing Robot (TR) and Defensive Robot (DR) would score points by throwing the arrows to the desired pot. Along with throwing, DR would also perform defensive tasks.

The ABU Robocon 2020 contest was to play rugby 7’s game using two robots and five obstacles as five defending players. This game's primary and unique challenge was Goal Kick, kicking the Kick Ball over the conversion post’s crossbar because of the rugby ball’s unique shape. Each team had two robots known as Pass Robot (PR) and Try Robot (TR). The PR picks up one Try Ball from the Ball Rack and passes the Try Ball from the Passing Zone to TR located in the Receiving Zone. The TR then goes along the five defending Obstacles to score the Try in one of the five Try Spots. After a successful Try by TR, it took a kick step from the Kicking Zone to make the Goal. The game continues until all the seven Kick Balls were used or when the 3 minutes passed.

Our Try Robot did the kicking process, and a team member manually placed the Kick Ball. The kicking Mechanism is inspired by a human leg, and it mimics the motion of the leg kicking a ball. Then the TR traveled to the Receiving Zone’s required position to receive the Try Ball. It had a damping system and an aligning system. Meanwhile, the PR traveled towards the Ball Rack and picked up the first Try Ball with the help of a gripper mechanism. After the TR reached the required position, it signaled the PR to pass the Try Ball. On a successful receive of the Try Ball, the TR traveled to the desired Try Spot avoiding the obstacles using a Path Planning Algorithm. Further, the TR placed the Try Ball in the Try Spot. After a successful Try, a team member put a Kick Ball in the Kicking Zone, and then the TR moved to kick the Ball.

The problem statement in 2019 was based on Mongolia's tradition of a message relay system. The theme “GREAT URTUU- message relaying system” required two messengers to coordinate the effective transfer of the message. To comply with the problem statement, the MR1 robot had distinct features like a holonomic drive and various subsystems. The subsystems included a Gerege holding and passing mechanism, an intercepting mechanism for receiving the Gerege, and a lever-based throwing mechanism. The MR2 design requirements were a robotic replication of a horse, i.e., a 4-legged robot, carrying the message through various obstacles. MR2 was responsible for completing the final task and convey the message of victory to the world by raising the Gerege. Our efforts in fulfilling the problem statement resulted in developing a modified Klann mechanism for the MR2.