The ultimate challenger! You only need to reflect polygons over a symmetry line. Sounds easy? even when the symmetry line is diagonal? Well - easy it is not.
The game has 150 levels, each consisting of 10 reflection puzzles (except for the first few levels which consist of less than 10). Levels must be completed by a given time. If the time elapses and there are still puzzles to solve in the level, you may either purchase "Timeless Polygons" - which allow time-free playing, or give up and retry the level. You can also elect to have 1, 2, or 3 more minutes per level. Other aids available are hints and complete puzzle solutions.
Starting from level 8 and above, you also play something similar to the good old Master Mind game. In the very beginning of the game a Secret Code was randomly chosen for you. Gemini Gym knows what it is but doesnt tell you. Each solved puzzle in each level reveals a level digit; when the whole level is completed successfully 10 level digits are available, which becomes the 10-digit Level Code. At this point the shown Level Code is compared with the hidden Secret Code. Every digit that is located in the same place in both codes is called a bullseye. At the end of the level you are told how many bullseyes the level has, and you get to guess where one of the bullseyes is. Statistically in over 63% of the cases there is at least one bullseye - and if you have got the Bullseyes Bonus tool you get bonus time for the next level. If you guess right the guessed digit in the Secret Code is unveiled. Once all the Secret Code is deciphered this way (takes 24 levels on average), you get a bonus of a bunch of Timeless Polygons (only if you have the Bullseye Bonus tool).