If you are concerned about the min max attributes on those inputs, I don't believe they really matter since the input attributes are type="text". min max should only be used with type="number". So you can enter any amount for THAC0 and the rest of the table's attributes will adjust without regard to min/max. Are you seeing something different? Removing min max would be fine since they do not actually affect the sheet. Background; THAC0 was added to the sheet replacing the included To-Hit tables without any discussion with the community or myself (the active sheet author, at least at that time...) Normally it's common courtesy to communicate before modifying an existing sheet. Much as you are doing in this thread. Thank you BTW. ;-) Many people like to use THAC0 in their 1e games although it's my understanding it was actually introduced "officially" at a later date. I've left both the To Hit table as well as THAC0 so that users can choose which they would like to use. I try to keep the sheet as true to 1e RAW as possible or at least allow variations to be optional. Anyhow, I don't believe the combat tables listed on p74 actually follow THAC0's scalable progression, right? I might be wrong, but the tables seem to be some crazy "Gygaxian" creation, which is partly why THAC0 became so important later on.