5MinToKill.io, a fun io-game in which you have to move through a large city and eliminate as many enemies possible. All you have is your fists and nothing else. You must then move about the city to find weapons like shotguns, machine guns, and rocket launchers. You can also look for ammunition crates that will allow you to replenish your weapons.5MinToKill.io, a fun io-game in which you have to move through a large city and eliminate as many enemies possible. All you have is your fists and nothing else. You must then move about the city to find weapons like shotguns, machine guns, and rocket launchers. You can also look for ammunition crates that will allow you to replenish your weapons.