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SkiFree opening screen
Pirih had created SkiFree in C on his home computer for his own education and entertainment. The game eventually attracted the attention of a program manager for Microsoft Entertainment Pack when he noticed Pirih playing it at work, leading to the inclusion of the game in the next Entertainment Pack release with Pirih's consent.
The game was featured in the Best of Windows Entertainment Pack and was available as a ported version for the original Macintosh. SkiFree was also one of seven games included in The Best of Entertainment Pack released for Game Boy Color in 2001.
In 1993, Pirih started work on a second version of the game, but it was abandoned for other projects as the original source code was lost. It was finally released in 2008.
On April 4, 2005, Pirih announced the rediscovery of the game's source code and the creation of a 32-bit version of SkiFree. The updated version is available on his official SkiFree website.
32-bit version 
Because the initial SkiFree release was a 16-bit Windows program, compatibility issues arose when running the game in newer versions of Windows. Pirih noted that users of Windows XP can configure the operating system to run 16-bit Windows programs, resolving the problem for some. Other solutions involve running Windows 3.1 in DOSBox or D-fender.
The problem has since been addressed as Pirih rediscovered the game's source code in April 2005, and created a more compatible 32-bit version of the game.
At the beginning of the game, the user has four choices:
- Enter the Free-style course (with the objective of collecting "style points" by doing flips, going over moguls, etc.).
- Enter the Slalom course (with the objective of completing an opened slalom course in the shortest time possible).
- Enter the Tree Slalom course (similar to the Slalom course, but longer, with narrower-spaced flags, and with trees interspersed).
- Enter none of the courses, and just "ski free".
On all courses, obstacles, such as trees and rocks appear, as do non-player characters such as other skiers and fast-moving snowboarders. Collision with any obstruction causes the player to stop and may lose valuable time or points.
The game contained an undocumented "fast mode" feature, accessed by pressing the F key.
Abominable Snow Monster 
Once the player has completed his or her run, the game does not abruptly end. Rather, the player continues skiing until he encounters an "abominable snow monster" who chases and attempts to eat the skier. From that point on, the player can ski until the monster catches and eats them.
The monster appears after the 2000m mark and pursues the player downhill at high speed. Further down the hill (20–30 m) another monster also gives chase, but uphill. An angled route while playing in "fast" mode avoids both of them, but afterwards the distance starts counting down from −2000 m. The world loops around on itself, and everything outside the boundary of the piste triggers the monster. However, if the player returns within the invisible border, the monster stops.
Other snow monsters appear when the player travels 125m upwards from the beginning or 500m to the left or right. It is possible (but difficult) to be chased all the way through the course from −125 to 1985m, thus generating a chase by two or three monsters past the end of the course.
- Answers.com- Microsoft: The Best of Entertainment Pack Accessed August 10, 2007
- Gamespot.com entry for Microsoft: The Best of Entertainment Pack Accessed August 10, 2007
- Creator Chris Pirih's Official SkiFree website
- "The Most Officialest SkiFree Home Page!" – Author Chris Pirih's website
- SkiFree for the TI-92 Plus graphing calculator
- SkiFree Original 16-bit Version