Daryl Powell encouraged his side to continue surprising people after their victory over Warrington.
A stellar defensive performance saw the Tigers advance to week two of the play-offs as they eliminated the Wolves via a 14-12 win.
Adam Milner and Jordan Rankin scored the tries for Powell's side, who will now play Wigan or Salford next week.
Powell salutes defensive rearguard after Castleford victory
Daryl Powell encouraged his side to continue surprising people after their victory over Warrington.
A stellar defensive performance saw the Tigers advance to week two of the play-offs as they eliminated the Wolves via a 14-12 win.
Adam Milner and Jordan Rankin scored the tries for Powell's side, who will now play Wigan or Salford next week.