Sleeping Dogs is an action-adventure game set in an open world environment and played from a third-person perspective. The player controls Wei Shen, a Chinese-American police officer who goes undercover and infiltrates the Sun On Yee Triad organization. The initial missions of the game are a linear tutorial for controlling the character. After these missions, the player is allowed to explore the game's world and take part in side missions and other activities. Shen navigates the world by running, jumping, climbing over obstacles, swimming, and driving cars, boats and motorcycles. The heads-up display (HUD) interface features a mini-map that indicates targets, key locations (safe houses and contact points) and Shen's current position. The mini-map incorporates two meters: one shows Shen's health and the other his face. When the face meter fills, upgrades are unlocked such as health regeneration, improved combat abilities and reduced equipment costs. The HUD also displays the weapon carried and its ammunition count. The game features role-playing elements based on three types of experience points (XP): Triad, Face and Police XPs. Triad XP is obtained through melee combat and violent actions such as "environmental kills". Triad XP awarded is directly proportional to the complexity of attacking moves. Face XP, obtained in civilian side missions, fills Shen's face meter and unlocks cosmetic items such as clothes and vehicles. By reaching a higher Face level, the player can freely buy vehicles or clothing. When it is full, Shen gains health regeneration, increased attack damage and other benefits. Police XP is gained by minimizing civilian casualties and property damage in missions and by completing police side missions. Gaining XP unlocks abilities such as hot-wiring cars and disarming opponents. The clothes, accessories and vehicles purchased by Shen affect non-player characters' reactions toward him. The player may also collect jade statues used to unlock melee combat skills. the player directs Shen to commit crimes, police response is indicated by a "heat" meter on the HUD. The meter displays the current wanted level; if it reaches 5, the police will aggressively pursue Shen. The meter recedes when Shen is hidden from the cops' line of sight. Police officers continue to search for Shen even if he leaves the wanted vicinity, and they will resume the chase if he is sighted. If Shen is arrested or killed by officers during missions, the player can restart from the last checkpoint. Some areas in the world remain inaccessible until milestones in the story are achieved. Although the player must complete missions to unlock content and continue the story, they may also wander the game's open world and participate in activities such as visiting a karaoke bar, carjacking, street racing and joining a fight club. There are several potential girlfriends for Shen. successfully dating them awards collectibles and bonus content. The completion of side missions rewards the player with new missions, vehicles, and outfits, among other things. The game has no multiplayer component, but online leaderboards are available for players to compare scores. Many activities that are not central to the story grant Stat Awards in three tiers: bronze, silver and gold. These unlock achievements and trophies