diff --git a/README.md b/README.md
index 37b5198..8df65ed 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ Day 00: Helper file                           | [aoc.clj](clojure/aoc.clj)     |
 [Day 22](http://adventofcode.com/2023/day/22) | [day22.clj](clojure/day22.clj) | Jenga!
 [Day 23](http://adventofcode.com/2023/day/23) | [day23.clj](clojure/day23.clj) | Compressing the graph for part 2.
 [Day 24](http://adventofcode.com/2023/day/24) | [day24.clj](clojure/day24.clj) | Don't ask me how this works.
-<!-- [Day 25](http://adventofcode.com/2023/day/25) | [day25.clj](clojure/day25.clj) | -->
+[Day 25](http://adventofcode.com/2023/day/25) | [day25.clj](clojure/day25.clj) | Monte Carlo to find "hot" edges.
 
 
 &nbsp;
diff --git a/clojure/day25.clj b/clojure/day25.clj
new file mode 100644
index 0000000..3aa4fc6
--- /dev/null
+++ b/clojure/day25.clj
@@ -0,0 +1,61 @@
+(ns day25
+  (:require aoc))
+
+
+(defn build-graph [components]
+  (let [adjacencies (atom {})]
+    (doseq [[k & vs] components
+            v vs]
+      (swap! adjacencies update k conj v)
+      (swap! adjacencies update v conj k))
+    @adjacencies))
+
+
+(defn add-edges [edge-counts vs]
+  (reduce (fn [edge-counts [a b]]
+            (update edge-counts (sort [a b]) (fnil inc 0)))
+          edge-counts
+          (partition 2 1 vs)))
+
+(defn traverse [graph start end edge-counts]
+  (loop [queue (conj aoc/empty-queue [start []])
+         seen  #{}]
+    (if-let [[curr prevs] (peek queue)]
+      (cond
+        (= curr end) (add-edges edge-counts (conj prevs curr))
+        (seen curr)  (recur (pop queue) seen)
+        :else        (recur (into (pop queue) (map (fn [x] [x (conj prevs curr)])
+                                                   (graph curr)))
+                            (conj seen curr)))
+      (count seen))))
+
+(defn find-most-frequent-edges [graph]
+  (reduce (fn [edge-counts [start end]]
+            (traverse graph start end edge-counts))
+          {}
+          (repeatedly 200 #(shuffle (keys graph)))))
+
+(defn remove-most-frequent [edge-counts graph]
+  (let [most-frequent (keys (take 3 (sort-by val > edge-counts)))]
+    (reduce (fn [graph [a b]]
+              (-> graph
+                  (update a (fn [nbs] (remove #{b} nbs)))
+                  (update b (fn [nbs] (remove #{a} nbs)))))
+            graph
+            most-frequent)))
+
+(defn find-groups [graph]
+  (let [edge-counts (find-most-frequent-edges graph)
+        graph'      (remove-most-frequent edge-counts graph)
+        total-nodes (count (keys graph))
+        island      (traverse graph' (key (first graph)) nil nil)]
+    (* (- total-nodes island) island)))
+
+
+(defn solve [input-file]
+  (let [components (aoc/parse-input input-file :words {:word-sep #": | "})
+        graph      (build-graph components)]
+    (find-groups graph)))
+
+
+(solve (aoc/read-file 25))
diff --git a/clojure/tests/solutions_tests.clj b/clojure/tests/solutions_tests.clj
index bc09d8d..23bedb2 100644
--- a/clojure/tests/solutions_tests.clj
+++ b/clojure/tests/solutions_tests.clj
@@ -4,7 +4,7 @@
    day06 day07 day08 day09 day10
    day11 day12 day13 day14 day15
    day16 day17 day18 day19 day20
-   day21 day22 day23 day24 ;day25
+   day21 day22 day23 day24 day25
    [clojure.test :refer [deftest is run-tests successful?]]))
 
 
@@ -48,6 +48,7 @@
 (check-day 22 [5 7] [418 70702])
 (check-day 23 nil [2394 6554])
 (check-day 24 nil [13892 843888100572888])
+(check-day 25 54 603368)
 
 
 (let [summary (run-tests)]
diff --git a/inputs/25.txt b/inputs/25.txt
new file mode 100644
index 0000000..58449f1
--- /dev/null
+++ b/inputs/25.txt
@@ -0,0 +1,1252 @@
+pzt: zfx qdv
+tzg: bqj
+fcj: znv sjk pqc zcr
+jrm: qpf lrs xgm
+dxx: lrz xvc pcs
+zbt: vpp khl hnc
+pjt: jbr
+qpf: trv gnl
+jjd: pnj lfr sdv
+xrt: lkc qfj bmx rtt
+vvl: mkq
+cdn: kkz fdl hsr
+sgq: xqd
+htv: qcb vgz jdz fqd llm
+mkp: kmj ktt dbg
+txd: hrf bcf lpr
+scv: jmj jdf glc
+kpx: xmd jqh
+zhj: qbq sqr rqr tvg tjs cnz
+vtf: slb gxt mrg
+bkc: gmk rmk
+jrj: xpg rsz qnp sln
+nbf: vcz tbn nfb
+xfz: jgh dkp mkc
+hsr: bqh vpp fkq
+dbc: hfb ksl fgs
+qls: pgg
+kvn: hfp
+fcr: vzx lfl jmj pmn spt sjl lgg
+kpq: jkj sjz dkc zhq
+dst: ftf thj smm ltr dkb pzt
+fgv: tzz prd hcq dkr
+qcr: vqs
+khl: fdl fbd
+gsn: rlm
+xrm: dkc
+sqf: mzj tkj ntf
+fpt: tmn dmp bls
+kst: cqt pmr
+lbb: gnd jtz dpm cmq cgr
+sjz: rxv kcp xpf xck mpp ddr dcm
+scs: kkg gxz
+mdq: sdh ldj dsg
+ppm: mjg kmd
+qbl: cmh vdz
+svb: jqr jsx
+bfb: fml bln xkj
+jnh: qbq vfd kqh
+fqz: ctq fqc zfb
+ndl: xmk njr
+zzx: nnf qqh tgm kzh kmr
+svm: rpb fpg pkc grk
+crm: smm dlg gnl vgz vnp
+qkf: jtr cvv ghs khg ntd
+rll: cbx vgt zfb
+spt: znb
+ckr: bfd xxq zkm
+nnd: kkz msm tdz gxk
+pmc: xkf tnr pbq
+pxf: tsp zcv
+fxh: rxl sxn zbb rmc
+mqs: mzj vkc
+jkl: xrl vln zpf lvg
+tkx: zgz vpp knn mzc
+bml: qcm tcq lvz lqs
+cfn: pjd
+pnj: pcc khl mbf bzp
+fsm: snd gmr mqf nrg
+ftt: hnc qrr qfb smr
+dhr: dpc
+mns: gbd tqh
+cdr: xvj sxn kcq
+cfc: zbh
+tlt: qxd xxg xlq jnx
+kkx: ltv
+jqq: pzv bkv jlk
+brr: sqf mrn mkp hmc sjz
+qgg: srn lvp dsg
+jnx: rpd scv
+cjc: xlh stk fdp
+ktb: rjx qdh szh sfq
+zfb: jzq
+fdz: dfp rsz
+phl: djf gql
+dxg: gxk skv
+qcx: pfp kmx spt ghp
+hhd: qzv qqh
+xsm: gxt hkb xtk cbx
+lkn: fnl htd mjt kvm
+xpk: gtl pxx gmh
+kxz: gmz mmm hpk
+ksq: jbr sdv hpt sfl
+mcx: mzg qcm mhc hgt
+pdk: lvg xfc jkv nfj
+nhk: kmd zgh ckr
+nnt: qxc pnj bdp sqz
+qfq: npp vnr fsq kgh
+ggq: xpg qlc nnx qjq
+nrm: rzv bln
+krc: xsz znt
+llv: vkm xfq xbk xvk
+tgm: vjt fmc
+bxg: jlv lvz
+vld: xgt
+hpt: tzp dtm vgq lmj glv
+qvx: tnr czl snh jmb
+qtf: dsj vtn
+zdp: ffr cbq tcp
+lxx: qkp pzt plr
+sdc: spr zbh
+bkq: zfx knp
+dhn: xkj hjr rnh
+jbx: nnm vgk
+kqk: xvx mhm ffv
+slb: lrt jcg rkb
+lvj: ffv ntl stz
+mpt: ztk
+jdg: mzp fcf jxv pxp
+slr: jjd svr jcg
+mdj: qrk vck jzx fqb
+nqp: hkk szb
+mlh: fhq
+thc: pqm rsh
+nrt: nrm btg qhr mpc kst
+smm: gnt
+jpm: plr
+qsv: fhq pbl kqk fjx qbl
+jlm: zdd czn bmr lcx
+sps: zgz jbr
+dtm: str
+vkh: btx
+hcp: fmc
+pmf: lnq vxb qfj mqf
+xvk: svl jbr mzz
+ftj: cnf dxp mjg hrz
+jmn: ddr sxv mzb nzk lgz dhp
+bjc: xxg
+snx: dbf pbm cjc xfz hlm gcn
+pbm: kps bkr rsr
+jjl: sfq drk rgv gcl
+dmt: ktp
+zzd: qnv
+tct: ftz glc dqc
+ssq: jcb
+dfl: qvt zcp mtn kcr
+xsn: fdl gqd vqs
+gch: sbt brs sct cmq gln
+tpb: nfg rpb trg bhh
+bmr: zxq vgh mts
+hhr: bhd xhf jcb krx
+hls: mkq rjx rzj
+spq: msq cmh rgv ddv pfp
+vhn: hnq sls bnc fdv
+fkk: gpm rdx kxb ndd
+lkg: qpf xpp
+qgc: mjm mct gbr
+hhq: gjp tmh tcp sgz
+nlz: vkc jgb xmd fbh
+lrs: fpm
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+jqt: glv bfb fpl btk
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+dxl: grb hjc srj
+jxr: sfl mbz nnc fbd
+qtk: pbq
+knp: tmd
+phb: vgk
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+bnd: zdg xlj mjg
+fxd: xjk dbt fkq vnr
+vzh: nnm dfq htd jqg
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+rqj: qts kvj pdd cpn
+crx: vpp
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+kcf: sfn
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+bxj: vnl xfl
+ntc: tng
+khm: jcb qpd
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+rqm: gbq
+ldb: tmg
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+qpr: lnq lfd qfb
+ckb: lxk nfb
+rlk: gxm pfr tbh gql
+kcb: ssh pcc
+lfc: ltm hdg xrf hrf
+xjm: kgr cbn vpf dlz dgh
+pzv: qrs njj
+vpj: qbq
+vxf: lhk
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+jlt: vdz mtb
+blz: ftx
+pkc: vrt pzr
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+rnk: fbd cqt
+ckj: jkv djf cxq llm ndn
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+nzz: nzs pqm nrg zhl
+lvb: dpj mzf
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+bfc: dhk
+czq: klv ssh
+npp: jqs pjt bhh gpm
+jmj: lqs rsm sml
+vgx: nfc
+mfs: ffv
+scn: fhq
+svg: jlv
+jjc: tbb lzn
+rcs: vcf fnx gnz smr llk xsz dtm
+pvk: gvx bpd mrc vck stm
+dzb: pdq dlt tcr hvd
+dpg: pdd
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+hmc: hkk
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+qnh: gks scn hkq hgk
+qvl: xvj
+dql: txn cdn rph zdp
+knb: ctq
+vxk: tjp
+zbk: kzh ffv xqd lbp
+qvv: jbs ldr bcq vkf
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+mnx: ktt
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+qfk: nfj zrz
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+kjx: dhr qtk
+zcp: pzd dmt rbk
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+fmt: zkn
+znb: jcb
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+xdl: kss tnp ggh bqh pdh
+qgn: dlg jph rmc qbl
+ndt: fjb vkh hgv
+grb: nzs
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+ltv: gfx
+rph: scj ztk nck
+skz: xzl jqj vnp
+khd: npr
+mpd: gkv pjd drp
+kgm: crx hpt fsb kvf fsq
+tbg: zrz
+rgq: mcj nfp kpm lcx
+lqf: vgx bjg
+zlp: kvk kpx lss
+nck: btx
+gcp: rgt jrk
+pbl: ftz qxd
+klq: kbg sqk sjk vhj
+gbr: prd bkn
+lmd: kgr pnv trg
+jgb: zkn jmb
+rmb: mhc lgd jbh
diff --git a/inputs/25_test.txt b/inputs/25_test.txt
new file mode 100644
index 0000000..bbfda0b
--- /dev/null
+++ b/inputs/25_test.txt
@@ -0,0 +1,13 @@
+jqt: rhn xhk nvd
+rsh: frs pzl lsr
+xhk: hfx
+cmg: qnr nvd lhk bvb
+rhn: xhk bvb hfx
+bvb: xhk hfx
+pzl: lsr hfx nvd
+qnr: nvd
+ntq: jqt hfx bvb xhk
+nvd: lhk
+lsr: lhk
+rzs: qnr cmg lsr rsh
+frs: qnr lhk lsr