Kirsten is the secret of India's win: Sachin

India won their first test series on New Zealand soil in four decades this week, their third successive test series victory since defeating top-ranked Australia in November.

"The secret to this success is the players are playing their natural game," Tendulkar told a Mumbai based tabloid on Friday.

"That can only happen if the atmosphere is good and the mind is free of any kind of pressure... it's the case of natural instincts taking over and that can be credited to Gary (Kirsten). The team environment is allowing players to play their natural game. That's probably the secret," Tendulkar added.

Tendulkar, the world's highest run-getter in test and one-day cricket, was second behind Gautam Gambhir in the runs tally for the team in the Test series with 344 runs.