The Random Mappack is a collection of 32 levels generated with a C++ script. The algorithm is naive and only places a random tile in each space on the map. A flagpole was added to each level manually.
It is not known if the mappack is clearable. One could argue that the player could just run over the top of each level, but the flagpole will prevent the player from ultimately finishing, requiring the player to find a route through the center. (Flagpoles act as a solid wall above the top to prevent the player from jumping behind them.)
An SE port exists, but some tile IDs are no longer blank due to the addition of new features, such as spikes. As such, the SE version is not clearable, because some levels block certain passages, and others start Mario on a spike, killing him instantly.