Doppio has completed a round of seed funding to the tune of €1 million.
The round includes investments from the Amazon Alexa Fund, the Google Assistant Investment Program, Sisu Game Ventures and other known game and tech investors.
Several angel investors from the world of games also contributed, including Unity founder David Helgason and Supercell game lead Lasse Seppänen.
As might be obvious from the contributions of Amazon and Google, Doppio specialises in "voice-controlled conversational games."
The investments will enable the Portuguese studio to develop more titles, grow its team and continue to support debut release The Vortex.
"This investment is a vote of confidence in the huge potential of conversational gaming," said CEO Jeferson Valadares. "There are already millions of voice-enabled devices out there, but few games have taken advantage of the unique opportunities created by voice technology.
"We're delighted to have received widespread support for our vision and look forward to working hard to achieve it in the coming year."