Four-letter word words of this length are upsetting to some, for religious or personal sensitivity reasons, such as: "" (UK), "", "", "", and "" (UK). Racist, ableist, and slurs pertaining to an individual's sexual orientation may also qualify, such as "" (in the UK not a racial slur, but short for Mongol, or someone with Down syndrome - previously called Mongolism), "", "", "", "", "" and "". Several "four-letter words" have multiple meanings (some even serving as given names), and usually only offend when used in their vulgar senses, for example: "", "", "" (UK) and "" (UK). A borderline
Bike or Die! mines, which can be randomly or strategically placed in the levels, or when the biker's body hits the ground or a wall. Later version introduced sticky and slippery surfaces, along with portals, which are quite difficult to work with, but produce interesting results. All of these features are supported by the level editor, Bike or Design. The bike is very springy and can wheelie, flip, or do jumps. However, if the bike has too much force when hitting an object, the bike will go through the ground, the biker will crash, and the level must be restarted. Gameplay progresses through