Digital Logic Gates Just Using Transistors NOR gate

Output is high until one or more of the inputs are used. More inputs can easily be included, as you can see the inputs share the same transistor base, you may need to add diodes to each input if you need to prevent any feedback or if you come across any problems, if there are switching errors you could also change the resistor values for each input, the 2 existing diodes are there to prevent basic switching errors.