Two Guys
Two real first-person views on one screen. Walls actually hide you — no fog rules needed. Peek a corner, take the shot, break line of sight.
First to 5 hits. Arena is randomly generated but 180°-rotationally symmetric, so neither side gets better cover. Back exits.
Desktop: views sit side by side. P1 — W/S walk, A/D turn, Q or E fire. P2 — ↑/↓ walk, ←/→ turn, Enter or Right Ctrl fire.
Install on iPhone: tap Share ⌐↑ then Add to Home Screen — it then runs fullscreen and works offline.