Rule 2.2 says, “As a weekly action, a staff member may buy one Guess for a number of Credits equal to ten times the current number on the Time Bomb.”
The Time Bomb rule was recently repealed. Therefore, regardless of what that thing on the sidebar says, the Time Bomb does not exist and there is no current number on the Time Bomb. So, the price of one Guess is ten times nothing, which is zero.
I buy a Guess for zero Credits. Shame I can only do this once a week.