Techies: How to stack mines | Dota 2 Guides
One of the more advanced techniques available to Techies is "mine stacking": placing mines directly one on top of the other so that the enemy can't tell how many mines there are at a location even if they have True Sight. In wc3 DotA this wasn't difficult to accomplish because you could portrait cast. This doesn't work in DotA 2, making life significantly more difficult. However, I did figure out a way around that: