diff --git a/games/open-adventure/Makefile b/games/open-adventure/Makefile
index ab21fb9e9f49..32ffce7ef0f7 100644
--- a/games/open-adventure/Makefile
+++ b/games/open-adventure/Makefile
@@ -1,33 +1,37 @@
 PORTNAME=	open-adventure
-PORTVERSION=	1.16
-PORTREVISION=	2
+PORTVERSION=	1.21
 CATEGORIES=	games
 
 MAINTAINER=	se@FreeBSD.org
 COMMENT=	Modernized version of the original Colossal Cave Adventure game
 WWW=		http://www.catb.org/~esr/open-adventure/
 
 LICENSE=	BSD2CLAUSE
+LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyyaml>=0:devel/py-pyyaml@${PY_FLAVOR} \
 		a2x:textproc/asciidoc
 
 USES=		gmake libedit pkgconfig python:build
 USE_GITLAB=	yes
 GL_ACCOUNT=	esr
-GL_TAGNAME=	${PORTVERSION}
 
 MAKE_ENV=	CCFLAGS="${CFLAGS}"
 ALL_TARGET=	advent
 
 PLIST_FILES=	bin/advent \
+		share/applications/advent.desktop \
+		share/icons/advent/advent.svg \
 		share/man/man6/advent.6.gz
 
 pre-build:
-		cd ${WRKSRC}; ${PYTHON_CMD} make_dungeon.py; a2x -f manpage advent.adoc
+		cd ${WRKSRC}; ${PYTHON_CMD} make_dungeon.py && a2x -f manpage advent.adoc
 
 do-install:
 		${INSTALL_PROGRAM} ${WRKSRC}/advent ${STAGEDIR}${PREFIX}/bin
 		${INSTALL_MAN} ${WRKSRC}/advent.6 ${STAGEDIR}${PREFIX}/share/man/man6
+		${INSTALL_DATA} ${WRKSRC}/advent.desktop ${STAGEDIR}${PREFIX}/share/applications
+		${MKDIR} ${STAGEDIR}${PREFIX}/share/icons/advent
+		${INSTALL_DATA} ${WRKSRC}/advent.svg ${STAGEDIR}${PREFIX}/share/icons/advent
 
 .include <bsd.port.mk>
diff --git a/games/open-adventure/distinfo b/games/open-adventure/distinfo
index 65cb1ef14036..b2375ec6a269 100644
--- a/games/open-adventure/distinfo
+++ b/games/open-adventure/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1689249973
-SHA256 (open-adventure-1.16.tar.bz2) = a151e3f918224e7f2495eeb2872bfe4f5dd95e8233ba2691c87c74303ad29747
-SIZE (open-adventure-1.16.tar.bz2) = 211155
+TIMESTAMP = 1779305101
+SHA256 (open-adventure-1.21.tar.bz2) = 8ddff48254f868999957bef5f9a1606140d8cacae4a4d87f676fd819876e57c6
+SIZE (open-adventure-1.21.tar.bz2) = 213935
diff --git a/games/open-adventure/files/patch-advent.adoc b/games/open-adventure/files/patch-advent.adoc
new file mode 100644
index 000000000000..4752515430dd
--- /dev/null
+++ b/games/open-adventure/files/patch-advent.adoc
@@ -0,0 +1,10 @@
+--- advent.adoc.orig	2026-03-22 14:43:05 UTC
++++ advent.adoc
+@@ -2,7 +2,6 @@
+ :doctype: manpage
+ // SPDX-FileCopyrightText: (C) Eric S. Raymond <esr@thyrsus.com>
+ // SPDX-License-Identifier: CC-BY-4.0
+-
+ // spellcheck: add advent logfile savefile roleplaying Gillogly PDP Ctrl-D
+ // spellcheck: add EOF autosave endianness wumpus zork nethack
+