Undertale is a role-playing game that uses a top-down perspective. In the game, players control a boy and complete objectives to advance the story. Players explore an underground world full of towns and caves, where They must solve numerous puzzles on their journey. The underground world is home to monsters, many of which challenge the player in combat; players decide whether to kill them, flee, or befriend them. The choices made by the player radically affect the plot and overall progression of the game, with the player’s morale acting as the cornerstone for the game’s development.

In each stage the player must move through a scenario seen from a top-down perspective, and his objective is usually to kill all opponents. Occasionally, you must also defeat a boss at the end of the chapter or search for key items as you explore; but most levels are faithful to the goal mentioned above. Likewise, the player has access to a wide variety of weapons for close combat and ranged weapons, which will be necessary to achieve challenges as they progress either through stealth tactics or through the use of brute force.

In Downwell, players control a “curious man” named Welltaro, who is at the local park one night when he decides to explore the depths of the well nearby. Knowing that monsters are waiting for him inside, he straps on his gunboots and starts his trip downwards, killing his enemies to proceed and collect treasure. The game has three basic controls: left and right movement, and the ability to jump while on a solid surface. When mid-air, pressing and holding the jump button fires from Welltaro’s gunboots.

Like its predecessor, Left 4 Dead 2 is a first-person shooter with a heavy emphasis on cooperative gameplay. The game presents five new campaigns, each composed of three to five smaller levels. As in the first game, each campaign is presented in menus and loading screens as a film starring the four Survivors; and features, upon completing a campaign, a faux credits screen which acts as the final scoreboard for the players and recaps certain performance statistics for the group. In every campaign, most levels involve the Survivors attempting to reach a safe room and close the door once they are all safely inside. However, the final level in each campaign requires the Survivors to call for rescue and either survive a prolonged onslaught until rescue arrives, pass through an especially challenging gauntlet of Infected to reach an escape vehicle, or collect and utilize fuel cans to enable their escape.

Left 4 Dead is a first-person shooter in which the player takes control of one of four survivors; if human players are not available, the remaining survivors are filled by AI-controlled bots. They play through campaigns fighting off the infected—living humans who have been infected with a rabies-like virus that causes psychosis. The overarching goal is not to clear infected, but only to reach the next safe area alive.