Allen was convicted of armed robbery while masked and felony-murder in the first degree as a joint venturer in the robbery, and we affirmed the conviction of felony-murder. Commonwealth v. Allen, 430 Mass. 252, 252 n.1, 259 (1999). Acting pro se, Allen subsequently filed in the Superior Court a motion for a new trial, a motion requesting findings of fact and conclusions of law, and other motions, all of which were denied. Allen then filed a petition, pursuant to G. L. c. 211, § 3, in the county court, essentially seeking review of at least some of the Superior Court judge’s orders.

Although Allen’s petition refers to G. L. c. 278, § 33E, he requests relief under G. L. c. 211, § 3. As we have said, however, relief under G. L. c. 211, § 3, is extraordinary, and a single justice does not err or otherwise abuse his discretion in denying relief where adequate alternative remedies exist. Lykus v. Commonwealth, 432 Mass. 160, 161-162 (2000). Because we have already accorded Allen plenary review on his direct appeal, he “is required to follow the specific provisions of § 33E for appealing from a Superior Court judge’s denial of a motion seeking postconviction relief,” including petitioning “a single justice for permission to appeal.” Id. at 162. Where the mechanism of G. L. c. 278, § 33E, was available, the single justice did not err in denying relief pursuant to G. L. c. 211, § 3. Id. at 161.

While the single justice properly denied the petition under G. L. c. 211, § 3, it is unclear whether Allen may also have intended that his petition be treated as a gatekeeper petition, pursuant to § 33E. For that reason, we remand the case to the county court for reconsideration of the matter as a petition under that statute. “[T]he decision of the single justice, acting as a gatekeeper pursuant to G. L. c. 278, § 33E, [will be] ‘final and unreviewable.’ ” Commonwealth v. Herbert, 445 Mass. 1018, 1018 (2005), quoting Commonwealth v. Perez, 442 Mass. 1019, 1019 (2004).

So ordered.

The case was submitted on briefs.