Monaco returns home on Wednesday in the Champions League quarterfinals for its second-leg clash against Borussia Dortmund after last week's brilliant 3-2 win on the road.
Last week's first leg was postponed by 24 hours after a bomb attack on the Dortmund team bus en route to the game in Germany which injured a policeman and left Dortmund's Spanish global defender Marc Bartra needing surgery on a broken wrist.
Mbappe suggested Monaco's attacking tactics and their teamwork have been the decisive factors in the Ligue 1 leaders making it to the semi-finals of the Champions League for the first time since 2003-04, when they lost to Porto in the final.
The Ruhr side are trailing 2-3 from their first leg match. "This is the proof that the project we put in place a few years ago is working", rejoiced Monaco's Russian vice-president Vadim Vasilyev on Wednesday.
"We can expect a lot stronger Dortmund than in the first leg".
We've had an outstanding run in the Champions League and we don't want it to end there.
Mendy and Mbappe then combined for Lemar to add his fourth assist of the knockout stages when he set up Falcao for the former Manchester United and Chelsea striker's 25th goal of the season.
"In the first leg it was impossible to be at a normal level, in terms of concentration".
Goals from Falcao and Valere Germain ensured victory in France, despite Marco Reus giving Dortmund hope after fine work from speed machine Ousmane Dembele.
Monaco joined Real Madrid, Atletico Madrid and Juventus in the last four of Europe's premier club competition, becoming the first French team to achieve the feat since Olympique Lyonnais in 2010.
Dortmund coach Thomas Tuchel told SkyTV before kickoff: "We didn't know what was going on". "We played well in Dortmund in the second half despite the circumstances".
Dortmund were earlier left unimpressed by their delayed arrival, which the Bundesliga club said in a post on Twitter was because the bus had been stopped by police "for approximately 20 minutes without justification".
"Our attitude has not changed, despite the first leg. I wish them the best and I think they can win the title".
"We know that tomorrow is a final, it will be necessary to respect our principles of play".