Playful Design
The objective of Playful Design is only to provide a "pleasant" or fun experience to users or people through interaction. It really has no other purpose than this. It can be identified since an experience or object becomes a "toy": something that allows the action of playing or having fun. However, it does not have elements of a game. The moment it starts to have game elements it becomes Gamification.
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For example, there is the Mexican sweet Pelón Pelo Rico is an excellent application from Playful Design since it is consumed by pressing a container down so that the content comes out through some holes, forming the candy as if it were “Hair”. This creates a "fun" experience that is different from the consumption of another sweet.
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Another example is a keyboard that when its keys are pressed, they light up in colors, thus causing a pleasant or fun experience.
playground design
playscapes
A playscape is a playful landscape characterised by the occurrence of enjoyment by the public and all those that interact with it. Sometimes playscapes look and feel like a natural environment. However, landscape architects and designers are increasingly using the term to express areas of cities that encourage interaction and enjoyment of all ages.
Playscapes, a term coined by Joe Frost in his 1992 book, Play and Playscapes', are becoming widespread within early childhood settings, often replacing or being built in addition to the rubberized surfaced, metal and plastic playgrounds.
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The natural playscape (or natural playground) is generally defined as a play space with as few man-made components as possible. Using native plants, rolling hills, and many trees, these playscapes represent a natural place such as a forest. Playscapes are designed with the intent of bringing people back to nature. (See Richard Louv's Last Child in the Woods: Saving Our Children from Nature Deficit Disorder,[2] 2005).
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Urban playscapes are similar to natural playgrounds insofar as they break from the need for specific play equipment; they are defined not by clear boundaries but through a shaping of the landscape to encourage play and interaction.
Playscapes offer a wide range of open-ended play options that allow people to be creative and use their imagination. Playscapes offer a wide range of developmental benefits to children, rehabilitation programs and all people in general.

Playground design is influenced by the intended purpose and audience. Separate play areas might be offered to accommodate very young children. Single, large, open parks tend to not to be used by older schoolgirls or less aggressive children, because there is little opportunity for them to escape more aggressive children. By contrast, a park that offers multiple play areas is used equally by boys and girls.
playground as art
Responsibe Design
Gamification in Education
Gamification in Productivity
Gamification in Enterprise Management
Gamification in B2B
Gamification in Marketing
Gamification in Social Products
Gamification in E-commerce
https://yukaichou.com/gamification-examples/#.WvItuFSpnyU
simulation and gaming
gameplay and playability
