diff --git a/Dockerfile.moth b/Dockerfile.moth
index 533919e..bf7f5ee 100644
--- a/Dockerfile.moth
+++ b/Dockerfile.moth
@@ -2,14 +2,11 @@ FROM neale/eris
 
 RUN apk --no-cache add lua5.2
 RUN apk --no-cache add lua5.3
+RUN ln -s lua5.2 /usr/bin/lua
 
 # Install MOTH. This could be less obtuse.
 COPY www /moth/www
 COPY bin /moth/bin
-RUN mkdir -p /moth/state/teams /moth/state/points.new /moth/state/points.tmp
-RUN chown www:www /moth/state/teams /moth/state/points.new /moth/state/points.tmp
-RUN mkdir -p /moth/packages
-RUN touch /moth/state/points.log
 RUN ln -s ../state/puzzles.json /moth/www/puzzles.json
 RUN ln -s ../state/points.json /moth/www/points.json
 
diff --git a/bin/once b/bin/once
index af4d152..c218aed 100755
--- a/bin/once
+++ b/bin/once
@@ -13,16 +13,19 @@ log () {
 
 # Do nothing if `disabled` is present
 if [ -f disabled ]; then
-	log "Instance disabled: doing nothing"
+	log "Instance disabled; doing nothing"
 	exit
 fi
 
-# Reset to initial state if `reset` is present
-if [ -f reset ]; then
-	log "Resetting state"
-	rm -f state/teams/* state/points.new/* state/points.tmp/*
+# Reset to initial state?
+if [ ! -f state/initialized ]; then
+	log "Resetting contest state"
+
+	rm -rf state/teams state/points.new state/points.tmp
+	mkdir -p state/teams state/points.new state/points.tmp
+	chown www:www state/teams state/points.new state/points.tmp # Needs root. Use Docker.
 	: > state/points.log
-	rm -f reset
+	echo 'Remove this file to obliterate teams and points' > state/initialized
 fi
 
 # Create some team names if needed
@@ -31,6 +34,16 @@ if [ ! -f state/assigned.txt ]; then
 	hd </dev/urandom | awk '{print $3 $4 $5 $6;}' | head -n 100 > state/assigned.txt
 fi
 
+# Install new categories
+for pkg in puzzles/*; do
+    cat=$(basename $pkg .zip)
+	if [ ! -f packages/$cat/installed ] || [ $pkg -nt packages/$cat/installed ]; then
+	    log "Installing $pkg"
+	    bin/install-category $pkg
+		: >packages/$cat/installed
+    fi
+done
+
 # Helpful error message
 if [ $(ls packages | wc -l) -eq 0 ]; then
 	log "error: No packages installed"
diff --git a/docs/overview.md b/docs/overview.md
index 4403eaf..94d2885 100644
--- a/docs/overview.md
+++ b/docs/overview.md
@@ -85,7 +85,7 @@ There are five entries in each instance directory, described in detail below:
 
 
 
-`assigned.txt`
+`state/assigned.txt`
 ----------------
 
 This is just a list of tokens that have been assigned.
diff --git a/www/cgi-bin/koth.lua b/www/cgi-bin/koth.lua
index 412d1b9..ad83c9b 100644
--- a/www/cgi-bin/koth.lua
+++ b/www/cgi-bin/koth.lua
@@ -98,7 +98,7 @@ end
 
 -- Traverse up to find assigned.txt
 for i = 0, 5 do
-	local f = io.open(koth.path("assigned.txt"))
+	local f = io.open(koth.path("state/assigned.txt"))
 	if (f) then
 		f:close()
 		break
diff --git a/www/cgi-bin/register.cgi b/www/cgi-bin/register.cgi
index c1ca49d..7017016 100755
--- a/www/cgi-bin/register.cgi
+++ b/www/cgi-bin/register.cgi
@@ -13,7 +13,7 @@ hash = hash:match("[0-9a-f]*")
 
 if ((hash == "") or (team == "")) then
 	koth.page("Invalid Entry", "Oops! Are you sure you got that right?")
-elseif (not koth.anchored_search(koth.path("assigned.txt"), hash)) then
+elseif (not koth.anchored_search(koth.path("state/assigned.txt"), hash)) then
 	koth.page("Invalid Hash", "Oops! I don't have a record of that hash. Did you maybe use capital letters accidentally?")
 end