tl;dr: Beyond All Reason is a free, open-source RTS inspired by Total Annihilation, featuring real-time simulation of every unit, projectile, and explosion, plus terrain deformation and ballistic physics. Gameplay emphasizes resource scaling, terrain-driven strategy, and large-scale battles across 10+ unit classes including Experimental units. Maps play distinctly due to terrain affecting radar, unit effectiveness, and tactics like nuclear strikes that physically reshape the battlefield.