programmed to sense whether the image sensor is covered, which is demonstrated in a microgame featured in launch title WarioWare: Smooth Moves, where if the player does not uncover the sensor the champagne bottle that the remote represents will not open. The Sensor Bar is required when the Wii Remote is controlling up-down, left-right motion of a cursor or reticle on the TV screen to point to menu options or objects such as enemies in first-person shooters. Some Wii games that depend on infrared pointing, such as The Conduit and The House of the Dead 2 & 3 Return, allow the player to calibrate the Wii Remote's pointer in-game. Because the Sensor Bar allows the Wii Remote to calculate the distance between the Wii Remote and the Sensor Bar, the Wii Remote can also control slow forward-backward motion of an object in a 3-dimensional game. Rapid forward-backward motion, such as punching in a boxing game, is controlled by the acceleration sensors. Using these acceleration sensors (acting as tilt sensors), the Wii Remote can also control rotation of a cursor or other objects. The use of an infrared sensor to detect position can cause some detection problems in the presence of other infrared sources, such as incandescent light bulbs or candles. This can be alleviated by using fluorescent or LED lights, which emit little to no infrared light, around the Wii. Innovative users have used other sources of IR light, such as a pair of flashlights or a pair of candles, as Sensor Bar substitutes. The Wii Remote picks up traces of heat from the sensor, then transmits it to the Wii console to control the pointer on your screen. Such substitutes for the Sensor Bar illustrate the fact that a pair of non-moving lights provide continuous calibration of the direction that the Wii Remote is pointing and its physical location relative to the light sources. There is no way to calibrate the position of the cursor relative to where the user is pointing the controller without the two stable reference sources of light provided by the Sensor Bar or substitutes. Third-party wireless sensor bars have also been released, which have been popular with users of Wii emulators since the official Sensor Bar utilizes a proprietary connector to connect to the Wii console. The position and motion tracking of the Wii Remote allows the player to mimic actual game actions, such