public Builder clear() {
        super.clear();
        isVisible_ = java.util.Collections.emptyList();
        bitField0_ = (bitField0_ & ~0x00000001);
        isExplored_ = java.util.Collections.emptyList();
        bitField0_ = (bitField0_ & ~0x00000002);
        hasCreep_ = java.util.Collections.emptyList();
        bitField0_ = (bitField0_ & ~0x00000004);
        return this;
      }