A new report out this week shows millions of Christians from 65 different traditions and denominations have now taken part in the movement which sees people praying for friends to come to know Jesus during the time between Ascension and Pentecost.
It's received support from the Pope and the Queen.
A survey of 2,600 people who took part this year showed 92 per cent were praying for friends and family members to come to know Jesus - with nearly two thirds of this group planning to follow up or talk to the people they were praying for.
70 per cent said they felt more encouraged to share their faith while 99 per cent said they want to take part again next year.
Archbishop of Canterbury, Justin Welby, said: "Once again the Spirit's work in Thy Kingdom Come has humbled us, stretched us and taken breath away.
"I have previously said I cannot remember in my life anything that I have been involved in where I have sensed so clearly the work of the Spirit.
"My sense of this only grows as we learn that this year we had engagement from followers of Christ in over 170 countries, take-up across the denominations and traditions and the clear focus on seeking the empowering work of the Spirit for our effective witness.
"I am looking forward to all God is doing in answer to our prayers."
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