The motion experiments with the Pac-Man particles are carried out directly without any further modification of the particles. Very dilute particle solution in DI water is prepared and motion videos at a frame rate of 40 fps are recorded using a camera (Zeiss camera (Axiocam 702 Mono)) attached to an inverted optical microscope (Axio observer from Carl Zeiss Microscopy GmbH). The The motion studies are performed on a plasma cleaned glass slide at different peroxide concentrations, using UV light (19.08 W cm -2 intensity, 385 nm UV LED from Colibri 7 light source). The speed from the motion videos are evaluated using Fiji (ImageJ), Matlab and analysed using Origin software. The speed of Pac-Man particles in different concentrations of H 2 O 2 is represented in terms of a box plot, the left side of the plot depicts the box with interquartile range marking the 5th, 25th, 75th, and 95th percentile of the micromotor speed, the middle line is the median value of the speed. The collective assembly is based on the principle of phoretic interaction of catalytic selfpropelling micromotor (active particles) with non-catalytic colloids (passive particles). The active particle generate a local gradient (chemical/electrical) formation of due to the asymmetric degradation of the fuel inducing local and confined interaction. These interactions are non-selective and independent of the size and type of passive particles (Figure ). Thus this interaction behavior can be easily adapted to other types of microplastics. In this manuscript, we used 2 µm, 5 µm PS (10 wt%), and 2 µm SiO 2 , commercially obtained from Sigma-Aldrich (Germany). SiO 2 microparticles are typical passive particles used in interaction studies as it facilitates 2D assembly close to the glass substrate. For activepassive interaction study, 10 wt% of 5 µm PS, 0.05 wt% of 2 µm PS and 0.05 wt% of 2 µm SiO 2 are prepared. Next, on a cleaned glass slide (plasma cleaned glass slides, precleaned with acetone and isopropanol), 1 µL aqueous solution of Pac-Man TiO 2 microparticles is added followed by 10 µL passive microparticles and 10 µL of H 2 O 2 of different concentrations. After the particles are settled, the solution is irradiated with UV light (19.08 W cm -2 intensity, 385 nm UV LED from Colibri 7 light source), and images are captured at definite time intervals (0, 30, 60, 120, 300 and 600s) using an inverted optical microscope. The number of passive particles in the cluster is calculated manually by Fiji using the "cell counter" plugin.