Guinea-Bissau missed a late penalty as they were held by Sudan in their Group D opener in the Africa Cup of Nations.
Midfielder Pele saw his 82nd-minute spot-kick kept out by Sudan goalkeeper Ali Abdalla, with Toni Silva striking the bar on the rebound.
Abdalla had been adjudged to have fouled Steve Ambri inside the area.
Joseph Mendes also twice went close for Guinea-Bissau, heading against the post in the first half and seeing an effort cleared off the line late on.
Earlier in Group D Kelechi Iheanacho was on target as Nigeria comfortably beat seven-time champions Egypt.