"Windows PC" can be "PC with Windows", "Windows-based computer", "computer running Windows OS".
"Challenging missions" is the last part. Alternatives for challenging could be demanding, difficult, or rigorous.
Tips and Tricks Use stealth: ProjectIGIIGI: I鈥檓 Going In hones in on stealth and strategy. Be patient, and utilize your surroundings beneficially. Choose your weapons strategically: Select the best tools for the mission, and ensure sufficient ammo. Navigate the levels: Invest time to explore the stages, and look for hidden paths and hidden items.