Remember those old Ben 10 Flash games? Hero Matrix was one of the cooler ones—you'd mix and match alien parts to create your own weird hybrids. Slap Four Arms' torso on XLR8's legs, give it Heatblast's head... that kind of thing. Half the fun was seeing how ridiculous you could make them look before printing your abominations out (RIP printers everywhere).

It wasn't deep, but messing with the combinations actually had some strategy—some parts just worked better together. And yeah, of course Cartoon Network shoved ads for their other games in your face afterward. Classic early 2000s browser game vibes.