If you want, you can google it, but then replace some names or anything specific to avoid people copy pasting the puzzle into google. For example, if the object in the puzzle is orange, you can switch it with apple... Anyway it's just an idea, it doesn't have to be like that. Alternatively, you can make a code.. something like this: Neila na si rednammoc esab eht In which if we read backward will become "the base commander is an alien" Please Register or Log in to view the hidden image! Of course you don't tell us that we have to read it backward to solve it... or you use number to replace alphabet... if nobody can solve it, you can give more hints time by time... Or whatever you think is easy.. something that will make players have chance to save themselves by doing a little effort.