Democratic National Committee Chair Ken Martin urged members of his party to forget their usual rulebook and go all in on partisan redistricting Tuesday.

Dave’s Redistricting is a web app developed by Dave Bradlee, a software engineer, that allows users to draw imagined electoral districts. Hobbyists can combine the relaxation of paint-by-numbers with the catharsis of destroying their political opponents in a fantasised redistricting process.

As Texas Republicans move ahead with redistricting to protect or even expand the GOP’s slim majority in the US House, Democratic-run states, led by California, are pushing forward with their own efforts to draw new maps and add Democratic seats.