AHC: Polish Superpower/Hyperpower Status
The Challenge? Put Poland into a position where it can become a global superpower by 2050, using a PoD at or after 1025 CE.
Hard Mode: Poland becomes a superpower by 1980
Very Hard: Poland becomes a superpower by 1980, but, the Second World War or a comparable conflict must occur which Poland must win.
Impossible: Poland becomes a global hyperpower, instead of a superpower. This means that Poland must either control the entire planet or have such extensive global influence that it can indirectly or directly control all or nearly all other countries with ease.
For a little extra challenge, add in Poland being the first country to possess fission weapons or Poland being the first country to reach space.