I understand you're looking for the "Quadraat OT" font, but I need to provide an important clarification upfront: designed by Fred Smeijers and published by FontShop (now part of Monotype). It is not legally available for free download unless explicitly offered by the foundry (which it isn't).
Would you like help selecting a similar free font for a specific project (e.g., book, website, logo)? Quadraat Ot Font Free Download