Can I just say how much I love love love how lots of new artisan-esque foods are popping up around Markham (please someone bring poke so I don't have to venture all the way Downtown).
CoolN2 as its name suggests is pretty cool (and as I am typing this, I am JUST realizing how N2 reflects the chemical name of nitrogen gas...). Their menu consists of:
ice cream - simple scoop with standard toppings
pop ice - pudding base, topped with fresh fruit, and in between are dipping-dot-like crunchy ice cream shards. The texture is definitely something quirky but fun to try.
dragon breath - cheetos spiked with liquid nitrogen that creates the illusion that you are exhaling poofs of "dragon breath"
Also note that most of their flavours are on the light and fruity side. You won't find any chocolate-y or dense tastes.
Although this place is pricey (the cheapest item is ~$7) note that you are also paying for the show of them making the ice cream. It's a somewhat complicated process, but you get to see first hand the hydrophopic nitrogen condense as the chemicals spill over your ice cream (my nerdy side is showing!!!)
The ice cream is not too sweet and definitely not the same quality as something else of similar price range. Nonetheless, the experience is truly unique, and you will not find another shop similar within the proximity.